They don't seem to mix well...

My idea was to try a closer range playthrough, because I have been playing as a sniper for practically 5 times. So I took Fast Shot.

Then I took Small frame because I play as a frail person (at this point I've forgotten that I took Fast Shot)

Only after getting past Nipton do I realize that the two are pretty bad combination.

Still, I want to make this work. Any advice on doing this build?

I have low STR and END, pretty good everywhere else. Currently I have 9 AGI thanks to Small Frame.

I ditched Varmint Rifle. I have Service Rifle, Sturdy Caravan Shotgun, and Weathered 10mm Pistol.