Mark,
Crunchy carpet is usually a result of a lot of residue left in the carpet (either soap or high ph cleaning product), which is not uncommon with customer’s using store machines (i.e. rug doctor). If my carpet is dirty and the bottle of rug doctor cleaner says to use 3oz, I should use 5 oz for my carpet right? (standard human thinking of more is better, which is not always right and we professionals can also fall prey to this with our products as well) In my experience, I would say go light on the 101 in your sprayer and maybe consider adding some Orange deodorizer (either to your solution, or better yet do a separate final pass with water with some Orange Deodorizer to act as an “acid rinse”). If it was really bad, I would say you may want to extract some of the worst areas with just water to help remove residue before you start our usual process.