I’ve never used a steel stand so I have no clue what’s best. It could just be the tank failing. If everything is level and tru. Then the tank just could be failing. Do you know the history of the tank?
Did it ever sit out in heat?
I believe that was the issue with the tank I bought. I think with the age and It had to have sat out in the heat for a long period of time, it caused the silicone to weaken. The silicone was so weak I could pull chunks off.