What should I continue from this point?

[Nyalia]

This is no longer completely true.

It does still hold true for 1/2 star crafts, but Ing / Ing II have a much lesser effect on 3 star and above.

E.g. Ing II does not lower a 3 star recipe below your current level and Ing II gives a higher quality gain than Ing I for 3 star+ crafts.

Right, I should have mentioned that ^^; Thanks for the catch! What I said is still true for every craft below 3-star crafts, correct?