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.
Increase your accuracy and control by playing the ball slightly back in your stance and shortening your swing
An inside out swing approaches the ball on the downswing from too low, hitting the half of the ball closer to the player, causing a push or hook which requires the player to work on getting the club further up and out on the downswing