Just sounds like a confidence thing. Your head is getting too involved with what's going on, and the pins know if you're being at all tentative through your release. Something else isn't matching up though, and it sounds like a shot shape issue to me. Anymore I don't pay much attention to hook potential, as long as it gives me the right shape on the backend, nothing else matters. If I'm getting tapped, it's usually shape, the ball just isn't going through the pins right, and a lot of 7 pins sounds like it's standing up on the backend or burning a lot of energy hooking rather than hitting.
Here's a trick I'm finding to be fairly universal on a house shot. Look at the 6 pin and shim to win. Get as close as you can to the friction on the outside without the ball hooking early, and get the ball going straight at the 6 pin, don't belly it or swing it. It will be in enough oil to get down the lane, but will hit friction right when it needs to and the angle will also help it recover/start moving. Your carry will tell you what the ball is doing and what you need to do. Change shapes until the pins start moving.