Any good tips to get a stuck cassette of a pro2 hub

do you mean the cassette has gouged into the freehub body by riding over the splines?

Tyre lever behind cassette and pull.

Put the wheel back in the bike with the cassette locknut off. Put it in the lowest gear. Get a helper to put some pressure on the pedals and hold on the rear brake.
Now use your chain whip to turn (hard) each sprocket in turn backwards. You should feel them slip out of the gouges they made. Then you can take the wheel out again and free each sprocket with a couple of screwdrivers.
This is a little easier if you've got two chain whips to turn against each other.
What cassette where you using?

I think it's a LX could be XT, 2 1/2 years old