Many items contribute to cooler line pressure.
If you have the converter feed hole restricted to .093 and still see 100 psi in cooler lines, I would check the cooler system and flow. If flow into the trans return oil system is restricted, that will build pressure in the cooler system, all the way back to the converter.
Any thing down line from the cooler ''out line'' from the case can raise the pressure. Cooler lines, cooler it's self if a low flow, the pressure will build.
When you run a high line pressure, the cooler system pressure increases. I typically see 70 - 90 psi in my T-400 setup for 2k horsepower. I restrict the feed hole in the stator to .120 usually. I also add a .050 hole for direct line pressure to the lube circuit so I know the oil is always there for lube and to keep the converter fully charged with oil if the engine RPM hits 8500 - 9500 RPM in drag race applications
The converter needs to be properly built to allow the fluid in and out of it.
Dont worry how old you are... it is the mileage on your body that adds up.