Based on the comments in this thread and after talking to someone at the pool, I bought myself some Zoomers! I got the blue ones but hopefully, as my ankle flexibility increases, I'll upgrade to the red ones (stiffer).

I figure I can wear them and do extra laps to work on my form. This will be in addition to my usual workout. Kind of a bonus treat and a way to mix things up a bit.

I've definitely gotten better since I started swimming regularly in May, but I have lots of room for improvement.