At least 80% of my mage's gear came from bonus rolls. 573 ilvl. Yes, I have the same problem you do. No vanq tokens and caster dps gear is few and far between. Been killing 8/14H for a while now and I've yet to get my gloves or weapon(two of the last heroic pieces I need). The only caster weapons we've seen have been from bonus rolls and I think 1 pair of vanq gloves dropped but I surely didn't win them.
Luckily I've coined both my trinkets and rings so once I get that weapon I'll relax quite a bit.