Welcome Kymco Owners!
I had the same issue. I'm 6'2 and the only thing the bothered me about the bike is the seating position. I was going to do a full seat rebuild and get it covered professionally, but then I saw a post on here from a guy who simply cut out the round hump in the seats base that's there to accommodate the helmet when it stored. With that removed and nothing else done to the seat, it allows you to slide back an extra inch of so. It's much better. I've been riding with it like that for 5 months or so now. I may simply leave it that way.