Sorry I don't have any further advice than has already been given but I will say that I am in your exact same boat and have tried all the same things with no luck. I have a 2yr male bee at 1400gs that would not breed last year and so far has not locked this season either.
I'm hoping the problem is just that the females I am putting him with aren't ready as WingedWolfPsion proposed.
I have some other snakes breeding but those females are exhibiting signs of being ready (i.e. staying on the cool side, off feed, tail wagging)
The females I have put with the bee with no luck are still on feed and still staying on the hot side.
Are the females you are putting your male with exhibiting ready to breed behavior?
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