Four games later..
After a solid day of relaxing playing Blood Bowl

I now have three GRs and have avoided "stacking" any of them with SPs, instead having two new skills on two of them and the newest GR has just gotten block.
Once I get the newest GR his next SP roll I will hopefully be able to buy one more to go with the really solid running play that I have created. Lineman to hold the people down, and two stormvermin to act as runners with my GRs.
My single thrower now has Hail Mary Pass, which compliments my second GR who has Block, Dodge and Diving Catch.
I have on an interesting note decided to avoid the Rat Ogre completely, and I think it has served me well. I havent lost a single game with skaven yet, and think that if I had a RO I definetly would have lost them.
So my three GRs are now skilled like this.
GR 1: Block Dodge, +1 Str (seven points to next roll)
GR 2: Block Dodge, Diving Catch (twelve to next roll)
GR 3: Block Dodge (sixteen to next roll)
I decided to get block on all of my GRs to hopefully make them a little harder to take down when they are deep. So far has worked a treat. Once I get my next GR I will have them both work in pairs, and move the SV into the line of scrimmage to hammer there.
Damn the skaven rock.
Thanks for all your help guys, just need to get my FF up now for some reason its gone down three times and only up twice.
EDIT: I actually used to play a chaos team and decided to run a skaven team for a complete change in the open league im playing in. Because of the chaos experience I am used to letting the enemy run the ball to me, but have found that the best tactic that seems to work for me is to hold up his forward progress with Lineman, and run a two pairs of GR and SV into his backfield, one from each side zone. I then keep a man or two in my backfield for "worst case" scenarios.
I think I will be getting strip ball/horns depending on the next roll for the original gutter runner now as well, but there are so many skills to choose from
