I honestly think it needs to go back to how it did, because I find it ridiculously tedious to heat an item. Takes about 1-2 FSC runs just for 1 round of heat on an item. And then that process is repeated over and over again. Don't bother saying Heat Amplifiers, because then that wastes your money, which is needed to upgrade your items.
I believe that you should gain more heat in levels, because that's the least you can do. It is ridiculous on how slow it is taking to get my Master Blaster to level 9.
So my suggestion: Gain more heat within levels or go back to the old system. There was nothing wrong with the old system then are things wrong with this system. There was literally no need to change.
This system puts me off playing the game. I come on and then I think something along the lines of what's on my to-do list, and then I think, oh yeah...more heating.
there was no reason to change exept free elevators. how would you balance that out?