Ah, a handyman. I avoid them for skilled projects.
"Not having time or experience using leveling cement to reduce the subfloor dropping a full 1" wall to opposite wall cabinet edge."
Cannot be used on a wood sub floor for best results.
"flooring left outside (covered, but exposed to outside humidity), I have sizable gaps forming"
Can't do that for best results either. The flooring is contracting and losing moisture resulting in gaps.
LD, I'm sorry you're going through this but...Going back to the basics is best.
http://uptownfloors.com/preparation/