That is a thoughtful and well-stated analysis!
Very well done on the no-crash record, in all those days. The philosophy of working on technique first and adding speed later is very smart.
I bet you would be back up to speed faster than you think, if you start with a couple of CSS days. Personally I feel a LOT less pressure to "go fast" at a CSS school day than I do at an open track day, which makes it a lot easier to make improvements and get up to speed using good technique, with fewer distractions and errors, resulting in more gains and lasting improvements.