Generally speaking, if you're finding something too aggressive, you might consider using fewer leaves. There aren't all that many teas that can't be tamed in some way or other. For example, in this YS tasting set, if you're finding any of them too bitter, it's probably not the tea's fault - I've had good, non-bitter sessions out of all of them. Just tweak your parameters a bit.
I plan to revisit alpha. I think you are right.