No, I think you are normal. The steadiness improvement from 7x to 10x is huge. 10x is the absolute highest magnification I can even begin to hold steady. To use 12x, I need IS or a tripod. I keep trying 12x because I like the details also, but I am just shaking too much.Seems like 12x comes down to your hands' steadiness. I don't have it. I know from some limited experience shoooting pistols at the firing range that my hands aren't steady. My sister seems to have inherited that, she easily outclassed me, with no experience, in hitting the bullseye on the targets.
The change from 7x to 10x is huge for me, I like the details at 10x, but it's obviously shaking much worse. Seems like some days are worse than others too, must be my biology....physiology