Why, when I attempt to hover, and start to go vertical ( and at low throttle), my left wing will drop prior to increasing the throttle to maintain vertical. Also when attempting to perform a large loop,
the left wing will drop on the front of the loop.

Thanks, guys !

Check your plane for lateral balance. I'm assuming you have the AW Edge (that's the only .90 size I know of) I've seen a couple fly and both had 1/2 oz of lead on one wing tip.

Do an inside loop then an outside loop.
If the same wing drops then I would suspect lateral balance.

BINGO !! You guys hit it right on the head! That's what it was.
I just added a little more weight to the right wing.

Thanks,