Hi Lex,
I experience exactly the same issues with my 450kg dome. I made a post about it on this forum a few days ago, but so far without a response, see:
In it I wondered if it would be possible to solve this with an end-of-event script (or even better: to slave in between imaging, exactly as you suggested before).
As it has been some four years ago since you made your request I wondered if you found a solution in the meanwhile.
Nicolàs