FWIW, I didn't read everything.
Low pipes get flattened unless reinforced or placed between frame tubes. Old time remedy was to get them close together under the engine and weld some angle iron on them to use as a bit of reinforcement and skit plate.
High pipes keep pipes out of danger, but not your leg! Here's my high pipe I made for the SR500, but it can burn a hole in a pair of jeans if the rider isn't careful, as my brother learned.
Made using mandrel bent tubing from JC Whitney (about $27 worth of U bends and a 45 deg bend and about 3 hr of cut, tack, modify, and TIG) It got chromed by mistake, was to be just nickle plated. The pipe looks gunky in the photo due to oil preservative sprayed on it from a long period of storage. The project is afoot now and due for a May finish date. The pipe gets really hot and will burn through clothing. A piece of a Harley pipe shield kit was added, but it's still hot. I hate the look of exhaust wrap and it was never used in the 60s-70s by flat trackers, so I'll just have to keep my leg away from the pipe - although I never did ruin any pants or burn my leg.
If I did a similar pipe again I'd get it ceramic coated, as I did with my KLX650 pipe. Good stuff with minimal care needed. Aesthetic Finishers in Piqua Ohio do good work and turn it around fast. They do coating for Supertrapp and just redid my pipe after the JetHot coating had rust bubbling on the megaphone from what appeared to have been poor cleaning when done ten years ago. I hope AF did a better job, it certainly looks good. The KLX pipe is an old BajaDesigns reverse cone megaphone pipe that is irreplacable unobtainum now.