A couple of observations:
first copper usually does not react well to ascorbic acid, especially the BROWN copper stains (the blue ones might but the bronw, grey and black usually won't).
second, you said you are on well water. Have you tested it for iron? I suspect that you have iron staining from your well!
I also suspect that the reason your copper levels are so high are linked to your use of trichlor.
first, is your clorinator before of after your heater? It should be after. If it is before it explains the high copper levels.
If it is after it means you have not been keeping tabs on your TA and pH because the only reason so much copper would dissolve is because your water was too acidic. This is fairly common with trichlor use.

Finally, even forgetting that your CYA is way too high YOU NEED TO DRAIN THAT POOL AND REFILL BECAUSE YOU HAVE 5 PPM COPPER IN THE WATER. THAT IS WAY TOO HIGH TO BE SWIMMING IN AND IT IS NOT HEALTHY. COPPER IS TOXIC, THAT IS WHY IT IS USED AS AN AGACIDE AND YOU HAVE ABOUT 16 TIMES THE ALGAESTATIC LEVEL IN YOUR WATER!!!
ANYTHING ABOUT 1 PPM IS TOO HIGH!

sorry for shouting but you really need to pay attention to that.
bite the bullet, drain and refill and treat your well water for the iron that I suspect actually caused your staining.