i use ingenuity>pride of labor>piece by piece alot. This combo if it succeeds(and it usually does) puts my at 60% complete with 100 dura which gives me a lot more chances to careful synth. When i do this i can usually get 90%+ chance of HQ on lvl 51+ synths.

if i get to close to finishing and still have plenty of dura i use ease the burden to remove 10%completion and raise chances of success.