Originally Posted by
WhyFi
Yeah, assuming that the chain was properly sized in the first place, you not going to be able to go bigger without a new chain. There is a chance that it wasn't properly sized, though; shift to your big/big and look at your RD - it should be stretched forward with some, but not a lot, of bend at the elbow. If there's a lot of bend, you might have a couple extra chain links to play with.
There is nothing improper about sizing a chain using the longest chain method of small+small w/o slack as long as you are within the capacity limits of the RD