Glad you're having fun with it!
There's a bit of a need to think around the edges with sorcery. There's no "fireball" spell, but you can bind fire elementals and achieve the same effect. Summoning and unleashing Spirits is also a way to go. Ive seen Pain and Fear spirits used to great effect like this. Its also just insanely cool to unleash a swarm of ghosts against your opponent...
Lots of the spells are more like curses, than flat out blasting spells. The various adverse "Sorcerer's..." Spells also act as something of blasting spells. Whack a guy with a couple blasts of level 4 Sorcerer's Weakness or Void, and see what happens.
Worse comes to worst, you could always make Wrack a variable spell, doing 1D4 damage per level. Even topped out at 4d4, that's still a goodly smiting,
All that being said, Deep Magic in AS will do exactly what you want. It's a fairly abstract system for creating new spells on the fly, or in the lab.