I tried using the transbrake tonight and ran into some limiter when on the throttle. makes the throttle close and open. can seem to pinpoint the issue. Its like the desired airmass is too low maybe and closes the throttle? maybe max map over BP? look at the end of the log.
Try setting your mapped point arrays to mapped points that are valid, like I show in the attached picture, and see if the cams settle down. You may also want to see what you can do about increasing the polling rate of cam positions. They are rapidly moving back and forth and that can't be easy for the MAF and throttle to deal with.