A couple of thoughts:
A clinch knot to the loop will eventually cut through the coating in the line and ruin the loop.
Energy transfer is more about your casting and line speed than your leader. Though the decades while drinking and listening to theories on energy transfer and hinging; I’ve used stiff butt leaders, flat mono soft butt leaders, braided butt leaders, leader loops, poly butt leaders and furled leaders.
Back when everyone used stiff butt leaders, they told you something soft would hinge and not transfer energy correctly. However, all of these various types of leader butts cast fine for me when I adjust the leader length or adjust to conditions, fly size & type.
I guess that means I don’t understand the hinging thing…
Before line loops or the add-on leader loops, I used to nail or needle knot some heavy stiff mono to the end of my line, leave it about 8” – 12” long and tie a SMALL Perfection loop in the end. I also tied my own leaders and put a Perfection loop on the end. When I tied my leaders, I would reduce the length of the butt section in the formula to compensate for the additional butt material on the end of my line. I then attached my leaders, loop-to-loop to that which meant I never had to cut any of that piece of butt section on the end of my line.
Another thing: I’m not implying this is what you are doing, but I have seen MANY times where someone THINKS they are doing a loop-to-loop connection, but in fact they are “cow hitching” one loop to the other so the loops don’t wrap around each other and compress. Make sure your loop-to-loop connection looks like
this.
I love line loops because all of my leaders have loops on the end so I can easily switch leaders as needed. I have no problems with them. I never had problems with the leader loops either. I find things hang up no more or less than they do with blood knots. The trick is to be aware when the knots are in your guides and lower the rod tip, even slightly to reduce the friction if a fish bolts.
Reels have drag for a reason...
Finally, if you have a Perfection loop or any other loop on the end of your leader, once you are sure it is secure, trim the tag flush and use a little UV Knot Sense on it or you can use a couple of coats of a contact cement like Pliobond like we did when Theodore Gordon was still poking around the Brodhead. It helps a LOT with hang-ups in the guides.
Good luck!