I've got my controller taken apart at work atm, cut a copper shim, but it's about 2.5mm thick, and sits at the same level as the capacitors. I planned on using that, and then just dremeling out a small pocket in the case for the caps to clear. but, was hoping that I'd be able to use regular thermal paste, instead of adhesive.. so I've got another shim about 1mm thick, so i'm guessing it's about the same height as your shim zero. I see that it's a tight fit.. do you think there's enough pressure to keep your shim in place, if it was non-adhesive thermal paste?