When I started to learn bunny hops last year, I started them as a progression. Getting the front end off the ground wasn't that hard to master, but getting the height that I wanted was tricky. (for getting over logs etc) Use the power in the rebound of your fork (I amly have about 3.5-4 inches in the front) but really put the momentum into the front end. The back end is super easy when you are clipped in, as you can lift it with both feet.
I found that speed is your best friend with bunny hops for the momentum too. If you can keep up the speed you have, then you won't be pulling up the front end and then the back in two different motions.
Last thing, yep! Bunny hops are both wheels at the same time!!
Good luck, and keep practicing!!!