I used only Artisan's tools to craft the HQ items for my masterbooks, and used the waste NQ's to purchase Supra Tools, so I've never crafted these items using Lucis. However, from what you wrote, it sounds like your problem might be easy to solve simply by dumping Ingenuity II altogether. If PbP*2 + RS*2 under ingen 2 will finish the synth, then most likely PbP*2 + RS*2 WITHOUT ingen 2 + CS2 will do the job and finish with guaranteed safety at the cost of just 10 more durability. The increase granted to RS by Ingen II is so abyssmally pitiful that if PbP*2 + RS*2 WILL finish the synth with it and WON'T without it, then a single CS2 should be more than powerful enough to make up the difference.

Take Ingen II out of your cross class skills list and replace it with Rumination. That way, if you get up to Byregot's Blessing and don't get the Good or Excellent you need, it doesn't matter how much CP you have left - pop Rumination, and you have enough to Reclaim.