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Thanks everyone for the tips.
I was given the wonderful suggestion of simply doing a one-star alignment on the star nearest my intended target to avoid slewing all over the place. Never would've thought of that but it makes huge sense. So I've done that tonight.
I put the OTA out for a few hours before starting, and I used the fan whilst getting aligned and focused, so temperature shouldn't be an issue.
I've also gotten rid of the coma corrector, which I think is actually the main problem. Despite what the various forums say, I'm pretty sure the spacing I'm using isn't right. Even dead centre I just can't get focus as crisp as I can without it.
And finally I'm using a vastly better, full-frame camera for a change. The live view is far superior and made the process a whole lot easier. It's happily churning out subs now.
Now the only real problem is the friggin' cyclonic winds that are doing their best to ruin the seeing..... if it's not one thing it's another!!!
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