7 CSII might mean you need more stats (craftsmanship). Muscle memory is a really good ability... cheap, and 1/3 progress guaranteed. RS is also great, but random and you need to be careful (I accidentally finished a synth with 1 RS because I forgot it'll do that on lower level recipes).

Also MMII is better than 2x manipulation. Both restore 60dur, it's harder to get MMII wrong and it cost less CP overall. I only really use manipulation in 40/35 dur crafts.