57trim, MSD DIS-2 ..spark plug gap ? ? ?

[ShadeTreeDSM]

what should my spark plug gap be with a t3/t4 .57 trim with MSD DIS-2 ? im currently gaped at 0.28 on BPR7ES', my car doesn't break up under full throttle. but when im cruising in 5th on the street my A/F's are 10.0-11.1 which is to low and the car starts to sputter.

 

[91dsmgsx]

the haynes manual says .032in i dont know why everyone insist on using a different spark plug gap than specified in the specs section of all the service information i have looked at.