FYI I was one of the beta testers for the RHO. You can use the level 3 with 91...93 is preferred but you can still use it.
It has been on our truck for most of our 10k miles...I use level 2 when towing our boat...Holley beat the crap out of their RHO, towing, more pulls than you can imagine and zero issues.
Logs get overwritten all the time....if there are issues, you remove the unit and drive it to the dealer or let it idle for a bit if it can't move under it own power and the logs will be overwritten.
Chris