You got it - there is a 10:1 reduction before a 360 tooth worm wheel - gives 64000 steps per degree with 1/16 microstepping. If I run lower micro steps, it's not too bad, but with 1/16 micro stepping, it's 0.75 deg/sec with a max rate of just over 20 (the best an STM32 can manage).
I just looked at the spreadsheet again - whoops - I thought you had to aim for >61200 steps per degree.
I though I had setup the variable step mode for slewing, but I'm not 100% sure that's working correctly.
Anyway, I've ordered the faster controller - I'm not adverse to having a spare controller as it's a long way to my usual dark sky site if something fails...
DT
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