Lean Spike with High Load

I run a 10.5 on a 10.0 idle; worksnice, and and 8 number split front to rear.
I got no AFR. When I punch it in second gear, it will rip the tires to shreds.
Here's how I know 10.5 is right for my combo;
I disabled the secondaries, and installed a plug in the front PV hole. Then went out and drove it, with a vacuum gauge stuck in the wiper where I could see it. Every time I depressed the throttle to see 10.5 on the gauge, the engine started to nose over, run out of gas.
So I pulled out my trusty Morroso PV tester, and Tee'd that same gauge into it, and started pulling vacuums on my collection. When I pulled on the 10.5, it seemed about right, so in it went, and the roadtest verified it.
So yeah as to all the other methods,I'd have to agree with
YR, they're just plain wrong.
I run the primaries slightly fat on the MJ, hence only the 8 number split. Fat because the Eddie headed 367 likes it,lol, and I don't care anymore about fuel economy.