That is yield %.
The recipe is
47% 2 row
47% Maris Otter
3% Corn Sugar(assuming 8oz now)
2% Crystal 60L
And yes i will check out mrmalty before brewing this. I still have a good week or 2 before I'm going to do it.
And if you think adding 2oz of centennial along with the 2oz cascade for dry hopping i could surely consider that. I have never dry hopped before, so this will be a first.