Ingenuity 2

I just got this skill. Is it worth slotting or should I leave it behind? I didn't notice a change in quality improvements with it...

Ing2 is for progress, not quality, and there are two main schools of thought regarding it: those who think it's necessary, and those who think it's not, i.e. do whatever you want with it.

If using ingenuity results few steps for completions, it is worth using for that particular synth.
if not, then no.

For synths lower then your level it pretty much does nothing. for synths at your lvl, it does very little. for synths above your lvl, it can be drastic.