I'm glad you found the tutorial useful. Good job on the even bending of the spiral loop on the large wrench, unfortunately the sharp bend you have put in it kills alot of the function of a loop wrench. Any time you have a sharp bend like that it creates a stress point that will further bend under higher tension. Normally this wouldn't matter as your not exactly white knuckling locks for tension purposes, but the other function of the loop wrench is as a plug spinner. If you have an American quarter sized loop wrench that sits in the keyway with the arm at 1'oclock, you usually pick the lock with tension at around 2 o'clock, but if you pick the lock in the wrong direction then you can load it to 8 or even 9 o'clock in the coiled direction and let it fly without deforming the wrench at all if it is well bent. It works in every KIK and to my surprise even alot of deadbolt's with some practice.
Another reason all the ones I have posted have the twist as close to the loop as possible is that it's a more direct application of force to the plug. The more circular the loop, the better it applies tension to the plug. Once you put that sharp bend in the wrench it becomes a place for energy to collect, and like a kink in a hose reduces water flow, then bend reduces the amount of tension that is acting directly on the plug. That's not based on text book theory so much as first hand experience. I have a mountain of trial and error tension wrenches in a drawer in my work area to prove it and some look very similar to what you have spun.
The final reason for the closed loop is that it fits on belt clip with my keyring, so it's portable and accessable. It's the first bottom of the keyway wrench I reach for not only because it's one of my favourite, but also because it's right there on my belt.
One thing I forgot to mention in the tutorial is that if you choose to bend one, make sure you coil it backwards. That is to say if you want the arm of the wrench to point to the right in a keyway with the pins at the top, bend it as though you wanted it pointing left. Then bend the wrench tip under the arm so you have a tight coil with no gaps. Does that make sense? You want the wrench tip next to the plug face, but bend it as though you wanted the loop in the way of the wrench tip, then reverse it.
I have a U wrench myself, as well as a double ended loop wrench. Great job again on forming the curve so smooth. I don't find much use for either because they simply won't fit in a tool case. I suppose you could patent the designs and start production, but that's not exactly in the spirit of DIY and I can think of better ways to go bankrupt.
Mine involves supplementing a young girls college tuition with dollar bills. Incidentally I also have a dual sided tensioner that works as a money clip. If I ever had any bills to put in it, then I wouldn't have so much free time to bend tension wrenches.