I'm grabbing loophole sml or dial tone.
It would not surprise me if all if those 3 brands use the same formula? The riders are all basically riding or selling the same shapes pretty much.
Also a '97 A wheel is bad idea in my opinion. I bet it's just a batch of 99s that failed a derometer test. I kind of feel like no one's wheel is going to be over 98A anyway if we tested them.
Bones/spitfire/NFG (loophole) are all in-house pours with proprietary formulas. I've always assumed that's why both F4 and NFG feel different from any other wheel in my opinion.
I think Sml and Dialtone both use creative urethane (although I think I remember reading that sml uses other mfg too), as does most of the industry beyond bones/sf/nfg. Orbs, speedlab, Jivaro, Portland, some Niki red (think they use generator too) , underground, maybe slime balls?, boardy cakes, prize fighter, and a bunch of other brands are all CU too. They're basically the bbs/PS of the wheel world - everyone uses them because they're very good urethane and have a ton of shapes and customization options. They have some really nice shapes too.
As for the 97a it's all preference. If you mostly skate parks or courts then it's probably going to be more of a hindrance than help but if you skate crust or ditches or even just want something to make cruising more comfortable then it might be great. I've got a set of 56mm 97a OJ/creature bloodsucker (hardline shape) that are a godsend this time of year when all the streets on my normal commute are covered in sticks, acorns, and lots of little stop rocks from the storm drains getting clogged with leaves. They crush through it all better than 99a F4 radials but are a little slower and don't slide as well (they do have a nice slide though).
Ive also tried 54mm 96a nikired conicals and mini logo 95a A cuts to try and keep it closer to my usual setups in terms of size and while the Niki red are really good, I have yet to find anything as good as the bloodsuckers. I'll probably pick up the F4 97 next time I order something from a shop that has them just to see what they're like.