If moving to the middle or even back to the top hole doesn't correct the lean spot, you might need to increase the nozzle size so it discharges fuel faster. It really depends where the lean spot is and how long it lasts. If it feels like a 2 second hesitation, then a smaller nozzle would cure it by lengthening the shot. Full throttle bog would probably require more fuel faster, so bigger nozzle and higher up on the hole. To start, I would put it in the middle hole, and check to see if the pump shaft top is 13/32 above the air horn so you know you are starting at factory spec and continue from there.

Cruise AFR looks ok. I run 15-15.5 and it doesn't surge in my W350 with TBI. I notice about 17 or so is when it feels like it's going to fall on it's face and starts bucking a bit.