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[kiwi]

The dealer game and their hedging can get old. The wiser of the dealers that are dedicated to high quality performance work know how to combine high quality machine work done by subcontractors and use the better of the SE parts to get a very good result. The tune and pipe are integral to this good result. So are many clearance checks a typical "parts changer" would not typically do.

The issues of oil consumption can be linked to valve seals but the program heads What are program heads?have the latest and they are fine. they work well for a while until they are worn due to the excessive clearance they build in to the valve stem to guide fit.Can this be rectified? Oil comes down the exhaust guide and eventually the heat builds carbon and the valves will seize. This could have been avoided if the MOCO used bronze manganese guides that compliment their high quality valves, Ferrea BTW.

If the rings didn't seal they were likely installed wrong simple as that. Dealer claims the rings lost tension and that this is a manufacturing fault?
When we get involved with any of this fitting of new pistons we assume the original bore is not acceptable and go right up to the first oversize. This assures that the bore and hone are perfect and they are precision fit to the individual pistons with torque plate bore and honing. We (and other high quality shops) can provide a tighter tolerance fit and  better finish when done in low volume, as we do. All a dealer would typically do is ball hone a newer barrel and use a standard piston. Works fine some of the time.

There is nothing wrong with the parts you choose. There are some assembly problems I am sure of it, plus the guide issue I described previously. We fix the guides before any airflow enhancements because of the severity of the issue and how that impacts long term reliability. These valvetrains have heavy high quality valves, decent valve springs of adequate pressure, and a lot of good things then they fall short.

[HD Street Performance]

There was a "dealer enhancement" program for 07-08 bikes and the touring models got new heads from what I understand. I have been out of the dealer loop for several years so one of the dealer techs could explain better.
They increased the press fit on the guides and that was not the issue. I stated what happens. Easy to fix by pulling the guides and replacing with AV&V parts and reaming to the correct size. I use their valves as well.

"Rings lost tension"
I seriously doubt that. Maybe if there is collaborating evidence from others but this is a first I have heard of that.
Let's try maybe the second ring was installed upside down.
Just saying what would be much more likely, or the original bore was not deglazed properly.