With your total timing set at 33, what does your initial timing come in at? I have had the situation like you describe where normal driving is fine but a snap to WOT and I have found that an improperly curved distributor can be the cause. If the distributor has too much mechanical advance, that can put your initial advance too low even though your total is fine. 33* timing sounds low, however my experience is with wedge engines, not hemis.

Also as suggested, checking your cam timing would be a good move at this point too. A pain I know, you gotta pull apart the front of the motor, but then you will have peace of mind knowing whether that is a problem or not.