B&M Converter is bad

Dyno tuning is about max power, normally. Had a bike "dyno tuned" a while back. Screamed up top but made absolutely nothing anywhere else......made riding two up difficult. I spent some time tweaking it. When all was said and done had it ran on the same dyno again. Ended up being down 1 hp.....with a worlds different power curve...Since then I have viewed tuning on a dyno as a racer thing....for everyday drive-ability it needs to be tuned on the road.....