Here's some bio pro pics from today on a rental. It was 2 scoops per gallon of bio pro, a very diluted flex fire rinse (2-3oz per 5 gallons) and a freshly recharged water softener coming out of a hydramaster titan 875.
This is pre spray, dwell and extraction with a wand. No agitation, not even a nike shuffle.
Pretty sure it was a polyester too. Great product Rob, definitely liking it more then my usual Chemspec PreKleen with Biosolve.
I would use your alkaline rinse but I haven't tested it yet and I'm worried how much crystallization it will leave on the carpet after it dries.