11.2% alcohol is on the high side for a dopplebock but its not unheard of. Nothing in your grain bill is going to make it bad or wierd or anything like that. Its just going to be a big beer, on the malty/sweet side. The only reason to use less is to bring down your alcohol % and make it a bit weaker beer.
If you are that concerned about it, just cut all your specialty grains in half. That'll still give you the flavors you're looking for, a big malty sweet beer but it'll balance a bit better and closer to 8% alcohol.