I tried the slow ring build first, but I honestly don't think you will be happy with that as a daily driver. It has too many bugs still (apps disappearing, opening then closing immediately, etc.). I then tried to go directly from slow to fast ring, and that did not work at all. Based solely on my own anecdotal experience, I would suggest moving back to 8.1, or even doing a system reset and restore from backup, then switching to the fast ring. It is pretty good overall, with just a few minor quirks. But, as a daily driver, it seems to be working fine for me so far.