After the gcd change to 1,5 seconds the engineer and magus abilities firebomb and rendwinds lost alot of there pressure dmg, where as before you could make use of their short cast times (1second) now after the change they feel slightly lackluster since youre still stuck for another half a second before you can throw another one.
My proposal is to up their dmg slightly and also increase the cast times to 1,5 seconds to better match the game we are now playing.