For your level you are doing everything right.
Just don't rely on Hasty Touch and Master's Mend too much. It requires alot of CP to get high quality this way.
I did this too for quiet some time but you need some luck to get HQ like that.

It's better if you try to find a sweet spot for using Inner Quiet+Hasty Touch+Steady Hand and then topping it with a Great Strides+Standard/Advanced Touch for a big quality boost.

1. Grab all +CP items you can equip.
2. Inner Quiet+Steady Hand+Hasty Touch -> use Tricks of Trade as often as you can to get CP back.
3. Do 5-10 successful Hasty Touches with a Master's Mend in between.
4. Use Great Strides and try to get a "Good" item condition by doing 1-2 Careful Synthesis/Basic Systhesis.
5. Use the highest Touch ability you got for a big quality boost.
6. Repeat 4.+5. till you have 100% quality or run out of CP or durability.
7. Use Rumination to get CP back and use them for finishing the synth.