[niles]

BEB.
The black cam is the "smallest" ---reread! If it stumbling; it's most likely lean. Your observation on movement verses cams is wrong. Forget about the .015 at WOT. Adjust the cam down until it moves/pumps upon throttle movement. Also everytime you change the idle stop adjustment(idle speed) you must readjust the cam spring. One half turns on the spring adjust nut will take you from stumble to right on to stumble!! Put a orange or green cam in and adjust like several have told you. quit messing with multiple variables and get the basics down.

gn