Hi Mike
I have ridden the 990ADV on the KTM day my local dealer puts on, I never found the throttle snatchy just very light if that makes sense. perhaps they had tweaked the bikes a little.
I was keen to get one but was not offered a good P/X for my 1150ADV so took my business else where and ended up with a 800GS which I am very happy with.
you are doing the right thing to take one for a test ride, couple of hours I would suggest
good luck
Tim