I'm gonna agree with this guy, that lever looks way to high. If the issue didn't start until after qs, you are still loading the shifter even if you dont think you are, lower it, test ride and repeat until it feels right.
are you finding yourself missing on the upshift also sometimes?
It's all about dialing in your controls.
Try adjusting it down and let us know.
Nothing you have done by adding the qs warrants a trip to the dealer/shop.
