Ok, something is puzzling me:

Leatherworker lv50, 328 control, synthetising:

- hippogryph leather (lv50 1 star recipe)
normal careful synthesis II increases progress by 46
careful synthesis II after ingenuity increases progress by 85

- dodore doublet (lv47 recipe)
normal careful synthesis II increases progress by 49
careful synthesis II after ingenuity increases progress by 43 ?!?

What's going on there? Is ingenuity actually supposed to hinder you when you use it on a recipe lower level than you? It looks like instead of decreasing the level of the recipe (or keeping it the same if I already exceed it) it raised the level of difficulty of the craft.