Thank you both! I'll take a deeper look at this on a day I'm not working a double, but I think this sets me on the right path. Interesting that it seems like there's a few stock files that use BTS regardless of egts.

I've read that tuning that map has better resolution than LAMFA, but is not as newbie friendly. Honestly though, seeing as that one is load and rpm based, rather than throttle position based, it does seem like the better option. Only downside seems to be losing high egt component protection.  If I'm not planning on going any bigger than a k04, how realistic is it that I'll see egts get high enough to worry about? Seems to me I'll run into knock issues before that ever happens.

I dont see a good reason to do it this way, honestly, other than just for getting a finer understanding of the lambda request path.

Why not just BTS and LAMFA in concert? There is no good reason to keep BTS disabled for so much.

There is no reason to delay BTS, really, especially if the stock file doesn't delay it.