That's a damned huge brown ale. 1.085 OG, ~54 IBU. If you insist on brewing it that strong, it'll take that much IBU to balance it (I think). It's also going to be black as the ace of spades with the original grist.
Also, depending on the source of your extract and the yeast strain you select, you could end up with a very sweet, underattenuated beer.
I'd knock back the Crystal to a pound, the Victory and Chocolate to a half-pound each. Delete the Roasted Barley entirely. Keep the hops where you had them in the original. Your BU:GU ratio at that point will be approximately 0.7:1, and that's going to be necessary to balance a beer that has little hope of finishing below 1.020.
Choose a yeast that will attenuate to 75% or more, and when managing the ferment provide optimum circumstances for the yeast to reach that point: Aerate well, pitch a little over the average rate, and keep the ferment temperature under control.
To figure out how much yeast to pitch, use
The Mr Malty Calculator. It's easy! I figured an OG of 1.077 (given my adjustments). That means ~15 grams of dry yeast. Good dry yeasts, from companies like Fermentis and Danstar, come in 11g sachets. You can pitch two 11g packets of yeast and not worry about overpitching. If you use a yeast like US-05, you should have a very successful ferment and an excellent beer.
If you still intend to use a yeast like S-04, pitch one 11g packet. Then it's best to
use a yeast nutrient. There are a variety of yeast nutrients on the market. The easiest to use is an old, out-of-date packet of yeast added to the boil. Often your LHBS guys will give you a couple packets of old yeast just to be rid of it; it can't hurt to ask the guy behind the counter if he's got any old yeast!
If you've got a micro or brewpub in your area, it can't hurt to ask them for some yeast, either. Don't be a pest; just ask if you can bring a sanitized container to collect a pint or so of harvested yeast. It helps if you're a known, regular customer of the brewery, of course. When I brewed for a living I gave away excess yeast all the time; if I didn't I'd have to find a way to rid myself of it in an environmentally-friendly manner - the local water people had NO sense of humor about increased bioload!
Cheers!
Bob