@MISkier body type, not thinking BMI but more type of build like ectomorph, endomorph etc. Meaning are you a "wiry guy" or are you solid trunk guy or you a tall skinny goofy guy(me)?
The whole point is skiing is not about muscle but about how you move on the ski relative to your center of mass (com). If you've got tree trunk legs/skinny arms vs skinny legs/more mass up top, it's going to affect 1) the height of your com and 2) the ability to move on the ski to work with the boat.
Your video posted above does take courage to post it on an open forum. Main thing I see is your skiing with muscle and not your frame. You're trying to accelerate using your arms/back/check. Like you're pulling. That's great for perfect pass but does not work with ZO.
Look at the better skiers, they have a leaning position not a pulling position. With the stronger engines and zero off, until you rewrite your basic fundamentals, you'll never own any real shortline passes and will be fighting being banged up.
Check out this video of a skier that runs legit 41's. his arms are straight, his shoulders are level and his ass isn't dragging across the boat. He's using his frame and he's leaning on the boat. His elbows are ON his vest not pinned to the outside. Sure he's in great physical shape but he's not muscling across the boat. hat tip to @Joelh
https://www.instagram.com/p/CEKlhNKBeV0/