Instead of correcting him when he is reacting to people, re-direct his attention back to you with toy or treats. I'm sure it is his age, but you need to work on it anyway. Positive works better than negative in this instance. The book Control Unleashed by Leslie McDevitt has great exercises for dogs who are reactive. I would order or borrow a copy, it won't do anything negative as far as SchH training goes.
By the time hes 15 months he should be good to go for his BH if you start working on it now(at your club too!).
By the time hes 15 months he should be good to go for his BH if you start working on it now(at your club too!).