couldn't have said it better myself.
You CAN steep oatmeal, but you'll end up with unconverted startches in your beer that are fodder for infectious bacteria. If you steep them around 150F or so with an equal amount of base malt then you'll be ok.
Treat yourself and take the metro into DC and go to the Brickskeller. You could spend days in there and not have the same beer twice! Literally the worlds largest beer selection!
It is next to impossible for a homebrewer to use too much yeast. Even with the "larger amount" you won't/can't overpitch. Just make sure they are the same strain.
I used this rec. http://www.geocities.com/iluvhops/brouwsel/rochefort8.html but used one jar of the belgian candi syrup instead of the sugar and used 3787 instead of the yeast they used.
Also its a Belgian dubbel not Belgium dubbel. Belgium is the place Belgian is the type.
I wouldn't do a dubbel with less than a pound of sugar. Are you using the rock sugar or syrup? I wouldn't even waste my money on the rocks. Even the dark rocks you won't taste the difference between that and regular table sugar.
IMHO you need some Special B in there as well.
I did 55% wheat
35% pils
10% Munich
With just over an oz of Hallertau (about 18-20 IBU)
and it came out great. Mashed at 151F. I have one in the primary that I did a single decoction on, we'll see how that one turnes out.
This is probably my best/favorite. I didn't make it up, but it's pretty good. I ended up using 3787 instead of the 1762 listed. Also used a bottle of the new candi syrup instead of sugar. Man is it good.
Rochefort 8 Clone
A ProMash Recipe Report
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