That's not the problem at all. An aggro deck doesn't want a hand full of 3-drops, that's all. You want to play as many threats as possible early, which you can't with 3-drops until you have 6 lands. Extra 1-drops is what aggro decks want. If you want your curve loaded with 3-drops, your going into midrange territory which is not what I'm looking for.
In this case, I'm trying warbosses instead of histories. As for the snubs, well I'm also just testing them (hadn't bothered with earlier builds) as pay-offs for getting to ascend. They've been decent so far, but I find their son draw-back is actually that they are a tell that you want to reach ascend and so they start counting your permanents and actually waste turns removing stuff instead of trying to race you.
Snubs are also interesting with the warboss, because mentoring them is easy. The other 3-drop I could cut is the marshal, but marshal also works better with the warboss.
In case I wasn't clear, the build-around is the warboss and ascend is a side-plan.
I'm not saying this is the best boros aggro deck available, I just really like the warboss but I've found it has been nudged out of decks because of other premium 3-drops (history in boros, chainwhirler in red).
How would you build a warboss deck?
But Snubs don't fit the bill of an early threat. 0 power doesn't reduce the opponent's life.
Warboss never inspired me to make a deck to be honest. Maybe Goblin tribal? Like you said, both red and white have more outstanding 3-drops. It's a very good Limited card imo.