With the heavier replacement spring backed all the way off, mine are usually around 100lbs at kick-down.

Is that 100 psi at around 1k rpms with TV fully depressed? If so, that's just a bit above stock.

Yes, at fast idle with the kick-down nearly all the way back. With the original spring, my line pressure was 85 to 90lbs. At 100lbs or so, there isn't as much spread in RPM between the 1-2 and the 2-3 shifts.

I had 125lbs or so for awhile but that caused the 1-2 shift to be several hundred RPM higher than the 2-3. Even with A&A's springs, the two shifts were too different for me. Besides, with the line pressure at 100lbs or so, the low speed shifts are much smoother. Which is nice running around town.

With 100lbs of line pressure the tranny seems to hold up okay. It has been there for a couple of years now.

I'm guessing the 125 line pressure was with the adjustment at 1 5/16" which is approx 6 turns from flush, and raises pressure approx 16-20 PSI. I presonally wouldn't mind the rpm diff or firmer 1-2 shift being a weekend driver.

I agree, trans go changed the throttle pressure spring and instructions several years ago, so go by the instructions that came in the kit.
When I rebuilt my transmission, I tapped the front clutch apply hole for an aluminum plug that I drilled slightly larger than the plug that came in the kit. That makes it easy to remove, and change the restriction size, but seemed like overkill since I never changed it.

"I agree, trans go changed the throttle pressure spring and instructions several years ago, so go by the instructions that came in the kit.
"
451Mopar...that's where the confusion arrises. As pointed out earlier in the thread, the instructions I have with the kit dated Nov 2011, there's no mention of adjustment after springs are installed. Only the TP/TV bracket adjustment for 1 7/8". Therefore, one has to assume you leave it at the factory 1 5/16" adjustment. Only after extensive on-line research did I find it's set flush.