DD is 29 inches and close to 22 pounds and I have her on the middle rise setting. It fits her fine, but I do like her diapers to fasten around her hips (if I fasten them higher they tend to sag on her.)
We also use aplix diapers, I have a hard time getting a good fit with snaps. With her BG Elementals, I've found that sometimes I need to fasten the top ahd bottom snaps off center -- I'll fit the bottom one to her legs, then will go in a snap on one (or both) sides to get a tighter fit in the waist.