I wish you all the luck with it man. It looks really great and all,...
Not trying to stir the pot here, just telling you MY story.
I did the same thing....Russian manufacture sidemount by "Kalinka", shell casing deflector, composite stock, bipod,....
And it shot like a bag of crap....its an SKS!! Its like putting lipstick on a pig.
I ended up selling all the accessories and putting back on the chu wood and it shot much better. (as good as an SKS can)
Hopefuly yours is a better story. Good luck.
50 yrd target...