I've been starting games to see how inital pool fare against tweaked decks, and I noticed that the original pools are fairly strange and unwieldly which is causing the early game to be much more difficult than it really should be.

Namely, they tend to have a lot of auras in them for some reason, much more than instants or sorceries. This makes playing red, for example, ghastly as I had 3 pools in a row with no removal in them whatsoever. The amount of multicolored cards can also severely impact the performance, forcing a mono-colored apprentice level deck into splashing. Again, with red it compounds the aura problem - if a number of your creatures are multicolored, and you can't play at least some of them, it easily happens that you're left with barely enough cards to fill out a 40 card deck (after lands) with more auras in it than the amount of non-creatures you'd put in a draft deck.

Can card-type ratios be customizable like basic land numbers are?