Varon Sound Change

Greetings, fellow conlangers!
Or, as in Varon: Trocev! (/trokev/)

I'm now quite satisfied with the language, and it's now what you could call
"stable", i.e. there won't be any major changes anymore (for a while
atleast). But now it's time to develop it's daughter languages. So I need
help on creating a natural sound change process.
My first daughter language will be Tulonian. I've earlier written that Varon
was constructed by the gods, for the humans living in the "paradise", and
when the Great Wars turned the paradise into hell, the language was slowly
forgotten. The remnants of the humankind spread over the face of the earth,
and languages developed. But one small "tribe" tried to "hold on" to the old
knowledge. They couldn't succed of course, because over a timespan of
several thousands of years, knowledge (and language) inevitably change, but
they did develop a "love" for the old knowledge.
Then, suddenly, a messenger from the gods sought up the tulonians and told
them everything they needed to know about the old knowledge. The holy
messenger brought ancient writings and learned the tulonians chiefs all they
needed to know. And the messenger told the tulonians that their mission was
to seek up all humans they could find and learn them the language, the
religion, the history, and so on. The language of the Tulonians were of
course ancient Varon. But over the time, the tulonians formed a land of
knowledge, and spread it across the world. Varon changed, and got a bit
mixed up with the tulonians own version of Varon, which had developed over
the thousands of years that had passed since the Great Wars. The sounds and
the meaning of words shifted. But the changes were small, because the
tulonian government tried to keep the knowledge in a state of minimum
change, because they were afraid to again "loose" the old knowledge.

Ok, now to my problem. I've made up several rules for sound change. I've
tried to read as much as I could on the net, and tried to get inspired from
other conlangs, but still I feel I'm "out in the dark". Can anyone please
comment the rules I already have (good/bad, naturalistic etc.) and propose
more and different rules? My intentions is that Tulon will be clearly
similar to Varon (many words will have no sound change at all), but it will
have a slightly more "modern" and "slim" feeling. I'm not sufficiently
"educated" to give a good "real" world example of the relations between the
languages, but I guess I want it to be similar the changes between classical
latin and medieval latin...

So, now this is what I have:

Varon phonetics:
The vowels are i, y, e, ê, a, u, o (X-sampa: /i, y, e, E, a, u, o/).
The consonants are p, b, m, f, v, th, t, d, n, r, s, z, l, c, ch, x, h
(X-sampa: /p, b, m, f, v, T, t, d, n, r, s, z, l, k, x, ks, h/)

The tulon phonetics are very similar, but they also have the vowel û, / } /,
and the consonants sh, /S/, and the Varon vowel r, /r/, is now transcribed
rh, because of the new tulonian r, / r\ /. The tulonians have also gotten
rid of the consonant f, /f/.

The rules are constructed for Mark Rosenfelders Sound Change program, but
here I'll use the X-SAMPA characters to make it easier to understand.

Defintions:
V(vowels)=a, e, E, i, o, u, }, y
F(front vowels)= i, e, y, E
R(rounded vowel)= y, o, u, }
U(unrounded vowel)= a, e, i
M(back or middle vowel)= a, o, u
K(unaspirated stop)= p,t
G(aspirated stop)= b,d
N(nasal)= m, n
S(??)= s, z
C(consonants)=x, T, p, t, S, b, d, m, n, f, v, r, s, z, l, c, ks, h, r\
B(aspirated consonants)= b, d, m, v, z
P(unaspirated consoants)= p, t, n, T, s

I hope you are familiar with the construction of the rules, i.e. [old sound]
/ [new sound] / [if this is true].

r / r\ / C_
r / r\ / V_    (i.e all but word-beginning r becomes r\)
K / G / V_V
x / S / V_
x / S / C_    (i.e all but word-beginning x becomes S)
f / / #_M
f / v / _        (all remaining f becomes v)
y / i / _#
u / } / C_C
u / } / #_(C)M
o / u / _#
o / u / _(C)M
E / e / #_(C)V
a / E / _(C)R
(ks) / s / M_#
z / s /_(C)F
r / l / _V(C)r
l / r / _V(C)l
y / i / #_(C)M
P / B / PV_V
P / B / B_V
K / G / N_
G / / N_
G / K / F_#
h / / V_V
e / E / F(C)_
c / (ks) / _S
S / / (ks)_
l / / lV_
i / / _y
y / / _i
e / / _E
E / / _e
p / / _#
v / / _#
F / / F(C)(C)_#

The order of the rules is also important, so please comment that too.

Here follow a short list of Varon words (with X-SAMPA if needed) if they are
any help.

cimol, /kimol/
heth /heT/
mem
cur /kur/
anc /ank/
honzor
ust
urê /urE/
rerac /rerak/
rusc /rusk/
trond
chamin /xamin/
archamin /arxamin/
cethuchis /keTuxis/
uron
lenvio
baohonzor
teurê /teurE/
acreron /akreron/
thêl /TEl/
eisti
taond
amêb /amEb/
hot
camra /kamra/
ariocamra /ariokamra/
êpan /Epan/
êscix /Eskiks/

I hope I'm not asking of too much!
I'm not quite happy with my phonolgy, so I'm in urgent need of tips
regarding that. You can maybe see on the wordlist and the presented phonolgy
which other sounds that would fit into the languages.

THANKS
/Martin

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