Ok, finally got this resolved, and I wanted to post the outcome here so everyone watching can get some closure.
Toromont came out twice to assess it. Finally the top guy in undercarriage wear came out to have a look.
He didn't see anything that is particularly worrying. He said it is common for tracks to want to push to the outside under load. Mine is favouring one side more than the other , but not enough to be concerned about.
I learned a lot about the system one design. It has undergone 4 design upgrades to cure initial flaws. Mine is the final design.
Some of the features of system one:
The idlers don't wear, and last the life of the tractor. Because of this, they need to be resealed occasionally.
The idlers don't ride on the rails, so the rails don't scallop like the HD design.
The chain doesn't have pin bosses like the HD chain, so the roller flanges don't impact them as they wear.
As double flange rollers wear, the flanges can get into the bushing seal area. With no pin bosses on the outside of the rails, guys would run the rollers well past worn out, which would start to tear into the bushings. For this reason, system one normally doesn't use DF rollers.
The bushings rotate, so segments and bushings last much longer than HD. There is no bushing turns to do.
He said, due to our non-abrasive soils, the rails would likely never wear out. The chains will be scrapped when dry pins become too much of an issue to put up with.
Recommendations to maximize my track life.
Swap chains side to side
Continue using existing carrier
Pull the shims out of the idlers. Its about time to do that anyway. Should cut down on vibration
discard the 4 most worn rollers, and replace with DF rollers(the same ones used on the hd undercarriage) in the #2 and #7 locations.
Re-sort the remaining rollers, rotate them 180, and install with best rollers to the rear.
Thanks for everyone's input.
