You really think thats why? Because the difference in about 10 gr of weight will not equal enough momentum to give you "several inches" more penetration, nor will it give you more speed (edit: at least not enough speed to quantify that much more penetration into the target). Either you were shooting a different spot on the target, from a different range, using a different arrow or you are just grossly exaggerating to justify not being able to make up your mind.

I digress, what is a onestringer? Sounds like a decent but not great day fishing.

If you want forgiveness, use feathers, as long as you don't hunt in the rain (you can always use the powder however).

If you want durability, use blazers.

I'd go with blazers, fletched helical.