Late to the party but I had to jump in and ask a few questions.
First off, there is no Audio Sync by Waveform similar to FCPX and PluralEyes in Avid right?
Yes Ive been using Avid for a long time but as far as plug-ins, I dont stray from the basics e.g. Sapphire and Boris.
Ive asked this question at the Avid forum but figured Id jump in here and ask away.
My workflow is almost the same. Full feature using my Scarlet and a SD 744T but no jam/timecode sync.
There is scratch audio good enough for me to sync using FCPX Audio Sync option. Its pretty bang on but my goal is to get all this in Avid and maintain the meta data flow to round trip back to Resolve.
It seems FCPX 10.1.3 and Resolve 11 are the only combinations that will let you read the FCPX XML Audio Synced files.
Problem is that after exporting to Avid AAF, its a freakin crap shoot whether most, some or any of the files transfer over.
Ive had mixed results every time 🙁