The NRS neoprene is called Hydroskin and is a fuzzy rubber with the fuzzy on the inside for warmth and comfort. The neoprene on the outside will not slide in the thigh hooks. Other manufactures have similar products.
Chest forward with arms and head to the side. Feel the boat with your knuckles. Wait till you can feel boat and air on your hands. Then you are set up. Start the sweep first and then immediately begin you hip snap after you start you sweep. Practice hip snaps and bracing. The hip snap is the start of the roll and the brace is the end of the roll. Finish with you head leaving the water last.
The cures for tennis elbow involve exercises to increase strength, increase flexibility, and/or stopping the aggravating motion. My cure was the third category. I have always been lazy about torso rotation while paddling, instead pulling with the arms, which strains the forearm muscles. So, with the help of some very good instructors, I have emphasized getting all my power from torso rotation for the last few years, and the pain went away. When it comes back, I know that I have been lazy, so I have to re-correct.
Get a soft foam ball and squeeze and release the ball with your arms extended in front and overhead. Do stretching exercises for the arms and shoulders. Too much repetative motion you need to counter with flexing and stretching in other directions. Look up carpal tunnel exercises for the elbow. Good luck.