thats part of your problem, low end packs in the class that needs nothing but the best. I would suggest SMC packs (the cheapest spot to get the packs made by the best manufacturer), the 5600mah saddle or 7200mah stick depending which pack style you run. Hard wired with deans is ideal due to the abuse those trucks take. Having packs get that out of balance is the cells not matched by resistance as good as they should be, low C packs just amplifies that. If you want to continue running those packs, set the LVC to 3.5v/cell+ and put the current limiter down to 50. You'll need a hotwire to change most of those settings.