Congrats on the BCG so far!!! You are doing great!
Yes, the statistics show (and I haven't looked the exact numbers up lately) that the maintenance regimen increases the effectiveness very significantly. Especially since there is a suggestion of high grade in your tumor, I would certainly push for doing the entire series of BCG. It isn't fun, but the alternative is worse!!!
You may be interested in reading about BCG on Dr. Donald Lamm's website
www.bcgoncology.com/treatment/bcg.html
He has been one of the experts in treating bladder cancer with BCG. His schedule of treatments can be a bit extreme...but all the information here is great.
Sara Anne