Lean pop off idle?

Don't think the cam is too big at all, from an earlier poster. The 050 numbers are only 2-3 degrees larger than the factory Magnum cam. Unless tappet lift is given, adv numbers are useless. You can pump up the adv #s by using low tappet lift so the mugs will buy the 'big cam'. As another example, how does 346 degrees adv duration sound for a cam that has 254 @ 050.
From the info provided so far, my money is on:
[1] Wiped lobe
[2] Lean under load; PVCR needs enlarging, tested by fitting larger pri jets, about 4 sizes bigger
[3] Sec ign problem. Bad leads, bad coil, bad plug, etc.