I had been used to riding on a relatively flat seat for many years. It was easy to shift my position by sliding backward for a while and then back up to the front during long rides.
The Vstrom seat holds you in one position and I didn't think it that comfortable at first. It did take me a while to get used to it. Now, on longer rides, I'll wiggle around, stand up or slide back up on the hump every now and then to keep from getting sore.
I've had it for two years now and it doesn't bother me as much, but it definitely took some getting used to.
Although the riding position felt mostly familiar to my previous bike, I do remember my forearms getting uncomfortable and stiff. I eventually got used to that too.
I'd have to say, I am now very comfortable on the bike.
Hang in there and give it some time. I think you'll be happy with the bike.
1968 Triumph T100C
Dnepr MT11 (Russian Sidecar Rig)