The right shaft makes all the difference....I just went to the 76 gram Hazardous Project X Tour Stiff shaft. It's like a piece of rebar but I get no whip...
Mine was an injury carrying an 600 # stove out of a basement. I got stuck backing out going up the stairs. That was at the height of my size I was about 325 then, I've been tapering back since then and found that flexibility is more important as I age than being built like a brick shithouse.
If your swing speed is slow, wouldn't the whip increase distance? In that scenario? I have a set with steel rifle shafts (old Calloway x10 pro series) and newer Taylor made w stiff graphite. Still trying to figure them out but getting better. I tend to fall back to my oldies in tournaments but try to stick w new when I can. But, it seems slow speed swing wouldn't be agreeable with either club. You have to torque em or it doesn't fly right.