That may be covered by the road hazard warranty. The tires were just changed on my old XX and the front Avon had close to 14k on it and still looked good except for the cupping.
You might look and see what chain they actually put on. The Bird takes about the strongest chain made. Look at the side plates of the chain.
The rear sprocket may not be aligned properly.
I used the Factory Pro kit.
I have read on here in the past that the stock filter flows as much if not more than a K&N. So the main advantage to a K&N is not having to replace it as often.
Running higher octane than you need could carbon up the top end because its not burning completely. Use the lowest octane you can without detonation/pre-ignition.
Higher octane lights at a higher temp which helps with detonation/pre ignition. If you run higher octane and don't need it you may carbon up the engine because its not burning completely.
If you can it would be best to get some adjustments from the stock Corbin seat when ordering. I never sent mine back for changes because I was afraid I'd never see it again.
To put it simply. Higher octane fuel has a higher point of ignition. It doesn't burn as easily as lower octane fuel. If you use it and don't need it you will just carbon up your engine.
I used the frame plugs from a 919. They are cheap, at least they were when I got them(under $5). They need a little RTV to hold them in place but it covers the holes and look like they belong there.
I don't have any problems hitting a false neutral. Bike now has 32k on it and has had M1 for most of its life.
The Triumph has the motorcycle blend of M1 in it now but I think I'll change it to the regular stuff on the next change.