The oil filter access porthole has such a fine thread on a large diameter that the risk of cross threading as you refit it is high. Better to drop the sump. Then you can properly tighten the new filter.
@cash1000 had foaming in his gearbox oil. He drained and refilled a few times before it stayed clear. We thought that it may be because of water getting into the oil, and the only path for water seemed to be the vent, which is in line with spray from the rear wheel. We both fitted a remote vent hose to avoid this. The vent plug thread is M6 x 1 mm.
Sorry, I was not local, just passing by. A Washington resident may know the bike owner. I liked the mufflers, swingarm, crossover, and stock airbox (he resisted the pod filter fashion). It would be interesting to know if there was a useful handling improvement.
It's lucky that you have a center stand on your bike, otherwise that would be really inconvenient.
On my bike, I noticed that the lower bolt was slightly bent as I put it back, so I take your problem as as warning.
While you wait for a better TPS, (see Phil's suggestion) try popping the bottom off and looking for the reason why you can't get enough travel. There may be plastic molding flash, or some other rework will allow you to get back on the road.
I measured the resistance of an old TPS that was worn and erratic but gives some representative figures.
Top pin to mid pin: 2.65KΩ Throttle closed; 2.65KΩ Throttle open.
Mid pin to bottom pin: 3.84KΩ Throttle closed; 1.22KΩ Throttle open.
Top pin to bottom pin: 1.22KΩ Throttle closed; 3.92KΩ Throttle open.
The TPS should read 157mV when the RH throttle is closed fully, well below the idle setting. I think you would see about 400-500mV at idle. To get the butterfly fully closed, the RH end of the interconnecting rod ball joint needs to be popped off, and the idle stop screw needs to be backed out until it doesn't hold the throttle open.
If the voltage reading doesn't change smoothly from below idle to WOT, then it's time to get a new TPS.
Don't ignore the tiniest cracks in the rubber tubes between the throttle bodies and inlet stubs. Replacing these should be a 10 year routine job.
The hairs on the back of my hands protect my knuckles from wearing out, but it's a bit hurtful of you to point that out. I hope a Drop Bear rips your bike seat, and your bananas go straight from green to brown
This knuckle dragger has had good results with 3M EC2216 epoxy. It is slightly flexible when cured, and like all epoxies, it has excellent oil resistance (when cured).
I was trying to keep things simple for @RichardCAwho tells us that he has limited facilities.