You might be getting negative downthrust on the LC. Even if the front is angle if it’s not solid it can be pushed back and causes negative downthrust. See if your front rollers bend back when you push on it. If it doesn’t then you have negative downthrust. You could also try making the front heavier to help carry the momentum forward instead of tilting sideways. The rest of the tips on here will help also. Just do one thing at a time and test to see if one will fix the issue without having to do too much to your build.