Running a Reds 521 Sport engine in my MP10T. Has M manifold with 2143 Pipe. I’m having some trouble with it on the track, as I’ve only raced electric for years until now.

Engine Broken in by standard procedure. Used 20/12% Break in fuel.

On track now I’m using 25-30% VP Fuel.
C3 Glow Plug

Here is my issue. I can get it to start fine, I pre heat. I can get it to idle happily on the box and crack the throttle with good response. I set the HSN by doing short WOT’s on the box first. Adjusting it so it was not too lean and over revving out. I set the idle gap roughly to 0.5mm. I set the LSN by cracking the throttle and letting off, seeing if it revved smoothly, bogged, and then I would listen to see if the idle stabilized. Once I drop it on the track, I can make about 5-7 laps. Then randomly when I let off before the end of the straight, or after I jump and let off the trigger, I will flame out. I’ve tried going small increments lean, still an issue. I go small amount rich, and it bogs and loses its umph. Not trying to beat the dead horse, but I’ve watched many videos and read up a lot of guides but I’m still being stumped. As whichever direction I go on my needles I am still fighting this engine. Any help is appreciated.