So, lately I've been doing alot of grinding...
...ALOT of grinding...
See, I got some CE, and I've been using it to make my first set of 3-star items (after playing for about a year, I figure I should do that). The drawback of this though, is that those items lose ALL of their heat when upgraded. The worst part is, from what I can tell, the damage/armor-ratings end up going DOWN, because I take a leveled 2-star item and turn it into an unleveled one. That kinda makes me squeamish about upgrading any of my older items like my Troika and Spur, which have been my best friends for a while...
It's also possible that I've missed some math here, as I'm a programmer and not a mathematician, in which case, disregard my lack of math and I'll go back to multi-threading....
Edit: sorry, I'm dumb. The suggestion here is that leveled items retain a fraction of their heat, making them not go down in power when you level them. Once again though, I may be missing math here...
At most, I'd say a fraction of EXCESS heat allowed for upgraded items. So when upgraded to 2-4*, items would retain a fraction of the heat not needed, i.e. 3* needs heat Level 5 to upgrade to 4*, so 'excess heat'=level 5+.
Otherwise no.