Basically everyone either goes all into Magicka or all into Stamina. If you run a magWarden, you'll use all skills that use magicka either from your skill lines or from the Destro/Resto staff skill lines. The more max resources you have, the more damage done by those types of skills, so it doesn't usually make sense to do a hybrid.

Don't neglect your Destro staff skills, particularly Wall of Elements. You also don't need both Shalk and Dive on both bars. That's just wasting skill slots. Add Wall of Elements (back bar) and Inner Light (front bar), moving Winter's Revenge to the back bar with Wall of Elements. That way you can drop Winter's Revenge and Wall when you initiate combat and then swap to your front bar.