@emi: idk of a mod to reduce popping. maybe try tightening the cube till it won't pop anymore. a test I usually do is to turn the top layer 45 degrees and try to pry out a set of the 4 edge pieces that form the edges during the 3x3 stage. i repeat for each layer and if it doesn't pop i deep it fit for solving, i keep cubes as loose as possible without explosions. but for modding, rounding the corner stalks would probably be a good place to start. that would, at the very least, reduce some lockups. I'd also smooth out the corner base like in the florian and (sort of like in the) v-cube 5 mod.