I own all of the Protanks from the 1 to the Uni and Aero and not a single one sits straight on any mod I have. The Mini 2 seems to be the worst. I've switched all of the bases on the 2s and 3s to the aero bases and they are not any different. I love the PTs but this drives me nuts. It doesn't show as bad on my Provari, MVP2 and E-LVT as it does on my Vamo 5 and SVD. What's the deal? Is it the PT shreads or what?