Here's a script that I use to with one click have rail with 90 fov,and with other 110(same button):

Code:

set ua_railch1 "weapon 7; g_fov 90; sensitivity 5; g_crosshairSize 100; g_crosshairCustom 14;set ua_railch vstr ua_railch2"
set ua_railch2 "weapon 7; g_fov 120; sensitivity 7; g_crosshairSize 30; g_crosshairCustom 6;set ua_railch vstr ua_railch1"
set ua_railch "vstr ua_railch1"
bind "MWHEELUP" "vstr ua_railch"

The problem is for example when I have used fov 90,and then switch to some other gun and bring back to rail it sellects fov 110 even if the 90 is my priority in cfg and in game.
Look at my script and tell what I need to do to tix it.