Currently, any heat absorbed by an item will disappear if the item has reached the amount of heat required to level up. I propose that the heat would remain in the item, and would be applied after level up. Thus, if an item reached level 2 and already had enough heat stored to reach level 3, the heat would be applied and it would have to be leveled up in the Forge GUI again. The change is very simple and merely serves to make item heating as fast as it was before the Forge update.