Hi means open and Lo means closed.

When you're setting, don't overdo the open bit or you'll not only lose top end , but also bottom end as the valves won't close the proper amount.

Do as Scott V says and scribe a mark on the plate where you can plainly see, and do so when the valves are fully open.

Fully open means that they've just cleared the top edge of the exhaust port, NOT hard up against the roof of their chamber. You should be able to stick your fingers into the exhaust port and feel a smooth transition from the port edge onto the valves. no steps.

Run the open/close procedure several times to set up and ensure that every time they are opening to exactly the same point, and they do it reasonable fast. If you're not sure then remove the cables completely and run the preocedure and watch how fast the servo works. You need minimum drag through the cables, so if the movement is slow when it's connected then you're cables are either too tight or need lubrication or replacing. Any drag will not only affect the performance, but could also overload the PGM and POP.........that's another bunch of cash out the window.

NSR's are all about careful setup. Get it right and you'll be rewarded with reliable power, but if you don't love it then it'll be a dog.