[Ski Pro 3]

I know this is going to fall on deaf ears, or start a pissing match but I gotta add my two cents;
No one is looking at a proper 'plug chop' with any of those plug photos so far.
To do a REAL plug chop, you must start with a fresh plug and a pre-warmed motorcycle. Install the new plug, and ride it for 1 minute at full Wide-Open-Throttle, WOT, the chop the throttle, pull in the clutch and hit the kill button. Best way to do this all local to the house garage is to start 1 mile from the house, swap in the new plug and ride back to the garage in the gear that allows you to maintain WOT for 1 mile and not excessively speed.
Once home, pull the plug and look down in the plug with a light and magnifying lens. You are looking for the base of the insulator. You should see a gray band, like someone ran a lead pencil around that base. The wider the gray band, the richer the fuel mix. The upper portion of the plug that looks tan tells you if you have the right heat range for your motor. This is adjusted by the plug part #. A hotter plug has a longer insulator than a cooler plug. Here is a photo showing several plugs that have been run for a plug chop and demonstrate the various richness of the jetting. For the photos, the camera man cut the threaded portion off the plug for easy viewing. You can do this too to get a good look, but I find a mag lens and good light source works good enough.
This plug chop is to set the MAIN jet. You can do more plug chops at 1/4, 1/2 and 3/4 throttle so you can also set the needle jet, the needle height (with shims) and the needle profile. Needle profile referrs to how fat the needle is as well as the taper of the needle. A needle that tapers quick is richer than a needle that is thick near the tip. The needle controls the amount of fuel that is coming through the main jet until the throttle is wide open and the needle is no longer part of the throttle process.

Lots of youtube videos how to do a proper Throttle Chop.
Here's a link describing pretty much what I just said;

http://kawatriple.com/carb/plugchop.htm

Looking at these plugs, you want to shoot between the far right and the one next to it. 2nd to the right is slightly rich, far right is slightly lean.

A good looking plug chop; nice ring and the insulator is tan. This indicates the jetting is good and the plug temperature rating is in line with the motorcycle's combustion chamber. Too dark instead of tan indicates too cold of a plug and too white of an insulator indicates too hot. You can actually melt the electrode on the plug if you use the wrong temperature plug.

 

[Ski Pro 3]

If it was up to me, I'd just invest in a plug spanner and a wire brush at this point .......

If it ain’t broke don’t try and fix it !!!!

I agree. And some carb cleaner perhaps.
My previous post was to just address the terminology of a plug chop.
The carbon build up is likely the valve guides or rings blowing oil past them and burning. If oil level seems fine between oil changes, then it might be a fuel additive or quality of the fuel. In either case, just clean the plugs and keep a spare or two handy on the road until you are ready to resolve any oil burning.