carb headaches

I need some advice. I own a dedicated 1988 autocross Mustang. The issue is that under hard deceleration along with sharp turns the engine stumbles. Once the car is staightened back up the engine responds great. Here is what i have and what I've done. 302 .040 over. steel gt40 heads 1.7 rockers. lunati .512 292 dur cam. torker 289 intake. MSD ignition (DIstributor, box, and coil) holley blue with aeromotive regulator. 1407 (750 cfm) carb. I have verified 5psi at WOT. Rechecked float level and drop, readjusted idle mixture screws. Moved the plunger to the bottom position of the carb. Checked timing (although the car accelerates great) Checked to make sure the fuel pickup is not occluded, enough fuel in the tank.
Side note, I have in the past ran a 1405 (600 cfm) without issue. Maybe the carb is to big? I have not had a problem with the car on track days or hillclimbs. Thoughts, ideas, and/or opinions welcome.

I did check that the pick up was within the baffle. I recall that I made a hard left turn which would have forced the fuel to the right side of the tank where the pickup is located. Thanks for the heads up on forum sub categories.

I checked, the baffles are in the bowls. Any thoughts on the spring loaded needle and seat for edelbrock carbs?