I might be tempted to increase the grain and the mash temps a bit - I'm guessing they leave a fair bit of unfermentables to give it some body and to cut through that relatively high bitterness.
No idea on the ratios though, I might be tempted to boost all the speciality malts except the crystals a bit, and increase the rye to around 10%, not sure you'll get any of the "bite" the rye gives at only 3.5%?
If it's a brew dog you probably need about 1kg of flame out or dry hops too won't you?

Be interesting to see how it turns out
