Mudmucker, Old Bay Rd is one of my favorite climbs!! I have talked about it here, a lot. We always stop at the top and eat lunch, by the abandoned farm shack. At times, I feel like I am in Vermont.
And Bolton is NOT flat... you should try Vaughn Hill Rd.
I have the same kind of asthma. Mostly, it doesn't bother me, but the humid weather has brought it out lately.