@davyludo Thanks for sharing your first hand experience, that is really helpful! Just a couple of questions:
Firstly, what exactly is stiction?
Secondly, when you talk about the 1.75" Steel tripod, do you mean the one they sell with the HEQ5 mount? Based on a rubbish picture online there seems to be a deepish inset in the centre of the tripod top designed for the HEQ5. Is that not a problem with the AZ5 that has a flat under-surface that links straight to the standard mount? I'm tempted to buy one if I can be sure it's a good fit. It sounds like the AZ5 is fine but 1) the standard tripod is not good for a heavier 'scope and 2) I didn't even try to balance it and it was fairly front heavy which will almost certainly have contributed to the severe shake at high mag when trying to focus.
It has been around ten years since I last used a Refractor on a mount. I've been using a Skyliner 200p Dobsonian with its customary rock solidness. It sounds like I don't need to return the AZ5 which is a relief, I just need a better tripod and balancing.