High Power Spring for Magpul 10 Rd AICS

I've been having problems with the last few rounds in 10 rd Magpul AICS mags feeding. The round appears to move forward and pivot the bullet tip up causing the tail to drop. I'm thinking a higher power spring could prevent this; does anyone make one?
The rifle is an ARC Nucleus in 6.5 CM. Feeds fine with 5 round Magpul mags; haven't tried others yet.