Cool, thanks fellas.
I'm mainly torn between the SMC and Promatch, HVR seems good for the info they provide and being lighter than the others.
I tried a full size pack in my RB6 a little while ago and really didn't like it, just hoping the extra 30-odd grams these other packs have wont effect it too much.
Saying that though, I didnt change the setup, just reset the height.