an older video... this vid sucks, but since the camera was mounted to the car, i had both hands, and you can see/hear how i powershift it when im full throttle (i didnt on the first shift for some reason). I dont ever let off when shifting under full throttle. never had problem, original trans.
https://www.youtube.com/watch?v=gZUBgVFIFus
funny as hell.. i went forever without putting the velcro behind my boost controller. its in the cubby. if you watch carefully, you can see it fall out and swing by its wire from the first shift lol.