Syl - Mine came with, what I consider, excessive throttle play. It was well within specs, but VERY annoying. Here's how you adjust it:
Out of the throttle assembly on the right handlebar, you'll find 2 metal tubes, bent 90 degrees coming out of the bottom. One of them has a loose vinyl/rubber cover over the adjustment nut.
Loosen the jamb nut, then loosen the adjustment nut until you are happy. Be sure to leave a LITTLE free play - You may even want to start the scoot on the center stand immediately after adjusting. If you loosen the bolt too much, it will be like applying the throttle ALL THE TIME. Very unpleasant surprise.
As for the jumping, were you wearing big thick gloves? Much like my crotch rocket - with the added HP comes throttle sensitivity. Gotta use soft hands. The power comes on early and quite strong. Easy does it, twist slooooooowly at first.
I don't find the seat uncomfortable, but it has gotten MORE comfortable in the past few hundred miles. Like any bike, there is a period where you negotiate the best riding position with the machine. A few miles under it will definitely help. Give it (and you
) some time to break in.
In case of a flat, a plug kit and CO2 charged inflator makes for quick repairs. Roadside service is a solid Plan B.