I use a dry rub, but not much because I've over-killed it a couple times!
My personal opinion, is that beef short ribs take a lot longer to break down the nasty stuff, compared to pork spare ribs or baby backs of course...
So - I always foil beefies, and they still take 6 hours + to get as tender as I like, and have the connective tissues all totally broken down.
HOWEVER - what I do is, I smoke them for 4 hours, then wrap them in foil for an entire hour...then back out of the foil for another 1-2 hours.
Once they come out of the foil, I sometimes dust them with just a LITTLE more rub.
Hope that helps you...I guess it's the "4 - 1 - 1" method! Oh - and I smoke them at 250°
I smoke everything around 250.