Well after months of trouble-shooting (long story) our AC is FINALLY working properly.
After all was said and done we ended up with a new furnace as well with some proper duct work around it all. Had the HVAC co we used pushed the new furnace in the first place we would have never had the issue with the new AC unit now working properly.
Oh well... we are now freezing (LOL) and set for winter with a brand new furnace that was way overdue.