Finally got to the track to run with center diff mod last Saturday.
Truck handles way different with center diff compared to how I ran with stock slipper and 30K front diff fluid / 5K rear.
The truck now wanted to snap roll way too easy and without notice going into sweeper after straightaway.

My setup was as follows:

Blue springs and sway bars F/R
32.5/27.5 shock fluid F/R bladder build, no boots, 6mm external shock limiters to prevent binding CVAs on outdrives
Rear shock eyes turned 1 turn out
Short front camber link with 2mm under ball stud
Long rear camber link with 1mm under ball stud
Camber link middle hole on rear hub
Middle shock mount on towers F/R
Outer on front arms / Inside on rear
Diff fluid: 10K F / 5K R
Center ball diff
23mm ride height F/R
B44.1 saddle mount run inline with GensAce 6K Mah Lipos
Chassis brace
3mm offset JC hazard wheels with AKA super soft Grid Irons F/R
MMP ESC 35deg timing 5300rpm to 18,200rpm / No torque limiting / No punch control
Tekin Pro4 4K motor
60/15 gearing
Castle BEC
Airtronics receiver
Savox 1258TG servo

Truck was very responsive but would traction roll without warning just getting into sweeper and bicycle very easily when going into 180 at end of sweeper. Very good on and off power steering, almost a little too twitchy.

Tonight we had a club race and I made the following changes before practice:
Long front camber link
5mm shims under front ball stud
Rear lower shock moved to outside hole on arm

In practice before the race, the truck felt completly different from Saturday. No longer did I have an issue with rolling. I could drive in hard into the sweeper, get on the bank, and drive hard into the 180 before getting on brakes to setup for the turn. On the negative side it felt like it was pushing in tight turns. After about 10min of practice motor temped at 165F and ESC at 115F. I ran it like this in the first heat.

Before the 2nd heat I removed 1mm shim under front ball stud for total 4mm shims. No rolling and pushing less but still didn't turn as tight as I would like. Truck was good everywhere else. Can get on the throttle hard and stays hooked up and accellerates hard down the straight. Was hooked up everywhere but would slide a little in the braking bumps before the 180 after sweeper if on the brakes hard. Super planted everywhere else. No problem clearing and backsiding table top leading to quad and clearing quad. More responsive on throttle compared to slipper setup. Down the straight you could see the rear end squat down and front tires balloon up pulling hard down the straight.

Finished 5th in Pro4 main. No fault of the truck. Driver made too many errors but much more fun to drive fast.
Let a few guys drive the truck after the race and one of those commented, "why do people say this truck is no good. This truck drives great."

Changes I need to try are going back to short front camber link with 4 and or 5mm shims to pick up some steering, try 7K in front diff, adding balast weight to sides of center chassis to settle the chassis down in bumps and ruts.