Wait till you tie both bodies together. Hold on to that throttle once you snap to see if they both settle back to it's even sync.
As slightly off as they were, when they sunk up and I blip'd the throttle, I thought the pistons were going to fly out of the head.
So, if say one bank is leading, then yeah, sounds like a bank of 2 could surge the other side. I'm just saying. Don't know if that cam and head are waiting to explode being that other surge of power you mean.
Sync screw wise, it takes a 90° screwdriver head and a short or working length Phillips tip to reach from the 90° ratchet to the throttle body screw. I use this style driver with a small broken mirror, a drop light, and stick light to get the reflection off the mirror that is sitting on the case.
On a scale from pain-in to the-ass... Ass being right at the top of the scale as in you do not have the patients and that tool setup to some sort of working twist to reach and see, then it is going to be one big A in the ss that you are about to tackle.
Tormenting the motorcycling community one post at a time