Hold one arm out with your palm down and with the other hand push all five fingers up and back to stretch the flexor on the bottom of your wrist
A tension filled grip, especially from having the shaft too much in your palms, will kill your entire swing. It stops your wrists from hinging naturally and then works its way up your arms and into your shoulders and locks up your entire swing.
Tee the ball a little bit lower, keep the handle of the club back and make sure to take the club back a little bit more to the outside