Not what you want to hear, but it sounds like the Microstar head is just not up to the task. The 1/4-20 counterweights look interesting.
I am not a big fan of the alt-az friction style mounts; I prefer having slow motion controls. Still, I use the AT60 w/ 2" diagonal and 41Pan or 31T5 on the Twilight Nano. The Nano has more trouble at high power particularly due to lack of slow motion controls (although it works) and handles the 2" stuff too. It helps that with the 2" diagonal the heavy eyepieces are pulled in closer to the pivot point. I was able to drop down to the 4" Losmandy dovetail for it.
The AT72EDII's bulkier/longer focuser has been a concern for me, and one of the reasons I don't have one. The rings end up far forward limiting options with the dovetail. The setup with the Vixen dovetail is effectively single position on this scope from what I see, so I would replace that with the slotted 7" AT dovetail.
Most - virtually all? - heads that are light and small enough for truly minimalist grab-n-go are not up to the task. This is a prime reason I favor zoom eyepieces for grab-n-go. There is no imbalance if you don't switch eyepieces, or don't remove the eyepiece at all.
But if you want more variety and flexibility during an observing session, you risk imbalance when switching eyepieces, especially if there is a wide difference in weights among the eyepieces.
I've had experience with slo-mo controls. I never liked them, for reasons I've given elsewhere. I prefer a panhandle. Unfortunately the optional panhandle for the MicroStar gets in the way of the AT72EDII. I could mount the panhandle pointing toward the sky, but that would be a ridiculous position for it. So I just leave the panhandle off.
I replaced the diagonal with a slotted 7" AT diagonal. It doesn't solve the imbalance problem for heavy eyepieces. What it needs is a counterweight toward the sky-end of the telescope, either wrapped around the OTA or attached to the end of the dovetail. A counterweight on the dovetail seems a neater solution to me.
Edited by Sarkikos, 05 November 2019 - 09:13 PM.