I've run several unipivot arms on suspended tables and they can certainly sound great. I think the controversy arises from the fact that if the table is less than perfect level, the azimuth of the arm is off by that same amount. A unipivot arm seeks level based on gravity, not by it's bearings or where the turntable is sitting.
When I ran a Basis Debut MK4 and later the MK5, I owned various Graham tonearms and the Basis often required leveling to put the Graham right.
Starting with a perfectly level turntable, a simple test for the Graham that can probably transfer to the Hadcock is use a very fine artists brush and apply micro pressure to the azimuth weight while listening. This makes it very easy to hear correct azimuth. If later the suspension (or floor) causes things to go out of level, a bubble will put both table and arm right.
I found this test both safe and effective. In a case where you accidentally apply too much pressure the fine, soft bristles push past the counterbalance and you start again.
I always used a retouching brush made from Red Sable, one of the smallest and softest for the job. For listening test I used familiar music with great staging and then a mono of spoken voice to make the adjustments.
