With the proposed HQ changes outlined for 1.20, a finished item synth will both: (a) require all HQ ingredients to HQ, (b) be 100% guaranteed to HQ with all HQ ingredients.
With this change, the current "touch up" mechanism (which applies only to finished item synths) will be rendered obsolete. I find that this mechanic is a more interesting and engaging one then the current material / part syntheses.
I propose that the "touch up" mechanic be applied to making ingredients in patch 1.20.
This would keep the mechanic of balancing out quality gained versus durability remaining, which I personally find more engaging then the "maximize quality" mechanic current in place for materials/parts.
Thank you for your consideration.