I had big problems getting hover mode to work consistently as well, sometimes it would sometimes it wouldn't. But I figured it out now, and I think it has to do with my screen protector because it works fine if I apply more pressure than I normally would. So try pressing harder than normal and see if it helps, because it definitely did for me.
Could it be the screen protector..Every other function is smooth with the screen protector probly the hover mode needs my touch..lol
Possibly.
To activate hover mode you need to swipe in from the left - so you have to start swiping off the edge of the screen. For example from undernear the ear-phone hole onto the screen. Try to do this fairly slowly and steadily until you get the hang of it.
In my case it's few times that I can activate the hover mode with a finger swipe but I have discovered it to always activate if I use the nail or the pointer rather than the finger.