Holley/Demon Carb stumble

Not trying to argue with you but when i put the ProForm main body on. When 4 size down on the front and rear main jet for the elevation i live in.
"This is what happened.

"Its together and i took it for a stomp. that's when the o2 gauge took a crap.
It didn't stumble and it didn't hook but then it started lean popping after the 1-2 shift. idled it back and check the float bowls and haven't started it sence."

OK so i richened it up 2 jet size but couldn't test in until i got to the track. It launched good but seem lazy and popped just as i lifted. it also seamed lazy up top.

So pulled the bowls and jetted back up 2 more jet sizes(what came in the ProForm kit.
took it for another stomp and it didn't pop and it didn't seam lazy on top.

Now you say the plug looks pig rich, and i agree, but if i go back down on jet it's going to pop.
I have went 4 (33 to 29)and then another 2 (29 to 27) smaller on the MAB.

When it was popping and banging in 2nt gear the AFR read14 at full throttle after jetting up 4 sizes total it didn't pop and bang and the o2 said 12 to 11s

I was racing at 10,000 foot elevation on Saturday, could have had something to do with it.

Ok now that i have said all of that i don't understand all of this.VVVVVVVVVVVVVVVVVVVV

You'll probably need Tslot restrictors. Probably need to be around .072-.078 for those. You can see where to tap the main body for those and use some 8/32 brass set screws to change the hole size. You need to do the primary and secondary side on those.

If i start throwing a hole bunch of changes at i will be so far down the hole i may never get back out of. It running decent now i don't want to ruin a working carb with stuff i don't understand.
Is this to improve the idle circuit or the Mains???????????????