I am guessing at this, as I was told a similar thing by another 2015 owner that said he was having a hard time and was pulling wheelies unintentionally. What I found was the throttle cables weren't adjusted properly, he had about 0.125 or a 1/4 inch of free play, between the push and pull cables. I have absolutely no idea how he ever rode that bike without getting into a accident. I very much doubt that is your problem, but I thought I would post this anyway.
So far I've only been able to find threads concerning this throttle quirk on the 1st and 2nd generation Versys. Since I'm looking to buy a new 3rd generation, I'm hoping that this problem was resolved at the factory before release of the 3rd gen.
This is not the first time I've encountered this problem on FI bikes. I had a 1998 & 2000 Honda VFR that had a slightly abrupt throttle from full off but it was much less noticeable than that on the Versys.