Well now im trying various versions of sneaker + sniper try out, dunno about that but best that i could get is:
st 2
pe 10
en 2
ch 1
in 10
ag 6
lk 10
small framge + skilled
skill points SG 155%, sneak 300% + ghost perk (which adds 30%, so 330% total), fa 62% (considering that you have 81 hp, not too bad

)
perks in this order:
silent running (level 6)
better critical (level 9)
weapon handling ( level 12 )
sharpshooter (level 16)
ghost (level 20 when you have 300% sneak skill)
Also you can modify this build a little by not taking sharpshooter and taking educated perk at level 6, so in this case: you would have sg skill of 171% while rest would be the same. (i check chances to hit, in first case to eyes from 50 hexes to 0 AC 43%, in second case under same conditions 59% not too good, but i doubt anything better can be reached)