It sure does help.
My current rain covers are mitten-shaped (1 thumb, 4 fingers) that have ripped at the base of the thumb, because the thumb length did not increase enough with the glove size. I have long fingers (just over 8.75" from fingertip to base of palm), so glove fit is often a problem.
I don't like how the stiff material of my current covers stick out from my fingertips. It catches the brake lever each time I stretch my fingers out from inbetween the handlebar and the brake lever. I am looking for a better fitting glove.
On the one hand, the Rain-Offs look a bit baggy and shapeless compared to the Aerostichs, which does not bode well for the "better fitting" part. On the other hand, you said that the Rain-Offs fit bigger than the Aerostichs, which increase the chance they will be big enough. On the third hand

I wear Held Steve gloves, which aren't as bulky as Gerbing heated gloves. It is a 3-handed issue, you see? :nuts1:
Mmmyeah, leaking Aerostich rain covers, that's not good.
Tucking the gauntlets easily for day-long rain is also an asset, especially if I want to attend a NNESTOC.

I also like the fact that the Rain-Off gloves really block the wind and keep your hands warm. Not sayin' that the Stichs don't do that, they just forgot to make the claim.
Yeah, I'll give the Rain-Offers a try. If I don't like them, I will completely ignore your "YEMV" and blame you, Phil.