Hi SanPro, I'm similar to you as I border on S/R. I treat myself as an S though and focus on my subtype which is occasional acne. I can use some stuff for the R types too, but found that my skin likes most S stuff better.
I would introduce one new product at a time, so you can see what the culprit is, in terms of the dryness and itchiness. Give it 7-10 days, then introduce the next product, etc.
The 20% glycolic cleanser is pretty strong. I would back off and use something very mild, like Cerave cleanser (not in the book, but many here love it - has those great ceramides for the dry types) or the Eucerin Redness Relief until your skin calms down. Then slowly work yourself into your routine and introduce one product at a time. If you do go back to a glycolic cleanser, start out with one of the really mild ones, with a much lower percentage. Then you can build up gradually. Then if you later add a retinol, do it every third night for a while, then evey other, etc, and build up slowly the way you would with retinoids. The Affirm 3x one is stronger, so try a milder one like the Neutrogena or the Affirm 2x, taking it slow.
It's so easy to jump right in and want to start everything at once. I get like that too since I love trying new products. LOL! I always have to force myself to wait a week or two before moving on or up, etc.
Marcy