Vibration, ride height and UCA questions

Since purchasing this truck with a lift kit already installed I've been trying to chase down a vibration problem. I've replace a bunch of different parts on the path towards figuring it out. The vibrations have lessened noticeably but are still present to some degree, primarily when taking off in first gear and intermittently at several different speeds.

Next on the list is front suspension. As I was meausing the front ride height I noticed that the left and right sides were about an inch apart. After some research it seems like the springs are higher on one side to counteract the tacoma lean.

Is it possible the one inch height difference is causing a front vibration even with the ECGS bushing?
What height springs should I go with to match my rear height, 884 or 885?
At what point will I have to replace the upper control arms with the stock ones to be able to align the truck properly?

Stuff I've replaced:
Both front differential bearings, one replaced with ECGS bushing
All 5 Ujoints
Tires (road force balanced two times)
Lowered rear by removing leaf springs
Checked driveshaft angle (approximately 1 degree difference)
Replaced diff and tx case fluid
Sway bar (was originally missing)
Alignment checked

Suspension setup:
Stock weight, no bumpers
OME 887 springs
OME nitrocharger shocks
Total Chaos UCAs
Dakar spring pack, one overload and third spring from the top removed

Ride height:
LF 22 1/2
RF 23 1/2
LR 22 5/8
RR 22 5/8

TIA