An EQ5 with dual axis drives would be quite sufficient for your 80mm. I've had the 150mm refractor, & now the C9.25 sitting on mine & as you know used to & still do high mag. planet photography. Have not tested it out on long time exposure DSO stuff as yet.
BTW I also did the deburring/regreasing etc to mine, but it was working fine before I did it.
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