Re the throttle play - ignore the manual
adjust the throttle for as little play as poss without increasing revs when turning the bars - ideally none.
You will automatically close the throttle to the stops when braking etc and you will have a dead spot if you have play when you get back on the gas especially round town. Try it you will reap the benefits.
It's a classic case of Aprilia covering their backside much like the run in criteria.
They don't want to say adjust it for zero play and the first corner you turn the revs soar and you hit a wall.
Look closely at the angle of your wrist on the throttle as well. Aprilia tend to have the whole mechanism angled back too far with the lever horizontal. you want a natural line to your arm/wrist/hand on the bars when riding.
I had to rotate my throttle quite a way forward otherwise at full throttle i had to be a contorstionist.