I had a good 93 octane tune, and when that tank ran out, I switched to E85. I changed my global settings with link and went to the highway to tune a bit. After several pulls, I noticed that no matter how much fuel I added, I wasn't able to get my afr's below 13:1 or so. On top of the global change, I've added an additional 30% of fuel! Wideband still reads lean at wot. I know for a fact it's running pig rich at this point, but I have no idea why my wideband continues to read lean. Btw, it shows around 14.7 at idle, which seems to me an indicator that there is no exhaust leak.

Boost leak test held at 30psi. I didn't test any higher.
I've checked for exhaust leaks and can't see/hear any.
I've swapped out sensors. (The alternate sensor was an old one I had laying around, not new, but was working back in the day.)