I'd cut the roasted barley down to around 3-4oz, you'll still have an srm around 23-28, which I think is just what you want. An alternative plan would be to skip the roasted barley and put 2 lbs of the MO in the oven at 350 for 30 min. You'd have about the same color but would have a nuttier, maltier beer. I'd make your 60 minute addition around 40 ibus of the highest alpha hop you have, then add around 2oz of EKG and .5oz of fuggles at flameout. WL007 will give you a very clean, clear and dry beer. I think you want something that attenuates a little less. There's obviously a lot of options, but my experience with WY1335 indicates it would give you exactly what you want.