I talked to the gunsmith at RIA again and he insist that a heavier spring, heavier than 16# would not work in the RIA 1911 10mm, He tried that out himself. I asked about the Colt Delta Elite 10mm using a 20+lb spring and he said because they had feed issues. He also said to add a shock buffer by WC, this will help.
The only was to verify the claim by the RIA 10mm GS is to put it through the test. I will let y'all know what I find out when the springs come in. The 16# will be here Monday or Tuesday, I'll order a 20 and 21lb Monday.
Spent brass to me is like the ring to Gollum "We wants it, we needs it. Must have the precious"