While I agree with the advice you have already been given and using a professional too as Merrylegs suggested, I wonder about the type of bum bar your float has? If it is a fiddle to do up then it's dangerous for you and not helping.
I would do float training with a self-latching type bum bar - so that it locks instantly (as on most Olympic floats). But of course don't stand right behind it - just in case!!! Have someone else near the back push it shut the moment the horse is on board and hopefully you'll catch him in time.
However I'd add a note of caution - if a real tough case he may panic once locked in. Some manage to slip under or flip over bum bars!! On the other hand he may give up once he realises he can't instantly race back again. Good luck!!
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