So I've never broken in a new motor before either, and I'm going to be here shortly. I was thinking of using the Joe Gibbs stuff too. When you say the rings are seating "just fine", how do you know? What are you listening for?
There were a couple things.
The truck had more power after the break in, leading me to believe that the treatment had been successful in creating a better ring seal. This was mentioned in contrast to the usual "if you use synthetic, your rings may not ever seat properly." I do not know the actual specific condition of the rings or whether or not they're perfect, however, the break in procedure made a clear difference in comparison to when the synthetic was in there. The exhaust pops (easy to monitor as a lean condition on the WB) practically disappeared and it idles a bit smoother. Wideband numbers are reading very stable, 15.3 at the leanest during idle. I still havent readjusted the timing though. I have been varying the RPMs up to 3k and allowing the engine to slow down on its own power since day 1.
The boost gauge I ordered hasn't come in the mail yet, but I can definitely feel the power difference before the turbo LED's come on. It can hold 40mph with ease in comparison.
If I were to do it again... keeping in mind that I have the thicker gray assembly lube in the motor
500 miles on high zinc break in oil, change.
another 1000 on high zinc break in oil, change.
about 10k miles worth of conventional oil, 3k intervals
Then switch to synthetic if all is well. Have heard some people running an extra bottle of zinc additive in the oil each conventional change, too. Not sure if I'll go that route.
I'm unfortunately living in a condo complex and therefore unable to do much to my truck until I move into a house in a couple of years. However the guy I bought it from put roughly about 8k into it with a new engine, new suspension lift, new clutch, etc. Here she is
It looks good! I like the rear bumper and the solid axle

Are you wheeling it yet?
Even small mods can be fun, hope to see some cool additions until the big stuff happens.