2.76 open to 3.55 Sure Grip...expectations too high?

Detonation at WOT must be avoided at all cost.
yur Power-Timing is always first, but just to make sure it is not too much. And as long as the All-in, occurs after ~3200/3400 you should be safe, and it looks like you got that covered. Iron heads usually like ~36* at WOT, but not too soon, cuz they will rattle. But in your case at 133 psi, rattling may not be an issue.
Yur Idle-timing can be just about anything. But if it upsets your TransferSlot to Idle Discharge Port synchronization, you will get a tip-in hesitation. 14* is about right.