I can't speak for Todd but I tried turning the max fan speed all the way down to 10%. It just cooled the pit slower.
I suppose a lower cfm fan would help. I'll check and see if there's one available that fits my damper housing. I'm also holding out some hope that deflecting the air flow downward will help.
EDIT Maybe there would be a software solution to this. If your damper is at 100% open and the temp still isn't coming up, reduce the damper to XX% and start the blower. I think there's some howling about making it so you can ramp the blower speed. With that, you could close the damper to 50%, start the blower, blower ramps to 100% (or whatever max set point), if temp still not reached, open damper to 60% and repeat blower ramp. Super complicated but I like the logic.
All this time I thought I was cooking good stuff by manually adjusting my WSM vents every so often. Boy, am I dumb.