Bob,
I don't think a 22 WSM's bowl vent locations are relevant for what you want to do, since the bowl's sloped shape isn't the same as a 22 kettle's.
Judging only by vent distance from the rim (or, visually, at the centerline) could position them too high (poor airflow, aka exhaust competing with intake) or too low, as they might be already.
I like MDurso's earlier hint to place the vents basically even with (or a little lower, if possible?) the charcoal grate. I wouldn't put them any higher than charcoal level.