The problem is usually caused by too much fuel in lefthand turns. Cliff notes:

Run as low a fuel pressure as you can. Stock float needles should get around 2 psi.

Don't trust a 0-15 psi gauge to be accurate at 2 psi. It won't be. Find a really good gauge that is properly calibrated and leave it in your toolbox. Or, without blowing anything up, build yourself a gasoline manometer. Gravity never changes...

Put your fuel pressure regulator right behind your carb on the firewall. If its on the driver side fenderwell, you get an extra psi or so in left hand corners.

Consider running 2 regulators in series if problem persists. Make sure the regulator is supposed to work at 2 pounds, and then distrust it anyway.

Set your float levels slightly low.

Lean out your idle circuit as much as practical.

Lean out your accelerator pump shot as much as possible.

You might want to do a search through the race carb section over at www.mazspeed.com also.