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.