sleeves
Nitrous
It will allow the ecu to trim and lean out the lower narrow band areas. But won't hurt it. Besides the vac lines, plug caps , and rhe cheap plastic fitting. I just recemtly heard of a feller having on of his injector O-rings which would be the lower one. Wouldn't hurt to lube them and spin them right in place. Ya just have to slide the lock clip back to rotate them a bit. And i would only wory about number 3.
Only other thing that comes to mind is a poor seal, or cracked boot on the injector body to the motor, but haven't seen or heard much of this as being a problem, removed and refitted a few now and they seat real nice and the rubber looks of good quality.
With the large pressure differential and non changing reading it has to be an air leak and if it happened straight after TPS change it should be around that area, being cyl3 it reeks of the 7th tube.
Suggest easy test, with bike running and TECU on and reading vaccum, manually unplug and block with finger, or even us pliers (not sidecutters) crimp the hose (not the MAP line, remember pics show from engine side) and watch the pressure readings if the pressure changes there's your problem hose.
Hang in there you'll get this