Alright, i decided to go with Seki's classic SG sniper build since it only relies to nuka cola, cigarettes and jet, and have good results overall.
Final result:
SNIPER 1 - classic Small Guns
HP : 231-261, normal res in camk2 : 6/25
SPECIAL :
ST 1
PE 9 + cigs = 10
EN 10
IN 1
AG 9 + nuka = 10
LK 9
Traits : smallframe, bonehead
Tags : SG, FA, OD.
Perks : more critical, even more critical, sharpshooter, lifegiver, better criticals, bonus rate of fire, right between the eyes + 1 perk (second lifegiver or even tougher or action boy, up to you)
Drugs : nuka cola, cigarettes, jet
Weapons : sniper rifle, .223 pistol
300% SG is a must have for this built as far as i understand.
I'm still not sure if i should go with Even Tougher, Action Boy, Lifegiver or Man of Steel perk for 8th perk.
Again, thank you all for your help!