You might want to stick to one keyboard, I use QWERTY.
Try setting all your network settings to the best possible:
/rate 25000
/cl_maxpackets 49
/com_maxfps 120
If you have low FPS, try changing r_picmip
0 = most detail
1 = good detail (/r_picmip 0,1, or 2)
2 = bad detail
I know some people who use ESDF instead of WASD, maybe you could try that if you wanted to, I did once, but I couldn't move for sh*t, so I went back to WASD
So here are some of my binds:
W - Forward
A - Left
S - Back
D - Right
F - Open doors / defuse bomb
Z - Zoom in
X - Zoom reset (don't ever use it)
C - Crouch
V - Crouch
Q - Medic
E - Sprint
R - Reload
G - Drop weapon
SHIFT - Walk