That, and the distance you push someone should be based off of your STR; currently Gale pushes just as far as Laezel does.
What? Not in my experience he doesn't. Most of the time when I shove someone with my casters, it just knocks them prone until the end of the round. Not to mention, the to hit chance is impacted by your STR bonus so your chance of even being successful with Gale is much lower. I just loaded up a save and checked that. 40% hit chance with Gale, 70% with Lae'zel.