I'd forget about the bumblebee for now. As others have said, he doesn't fit in with your axanthic projects and the only way to make him fit is going to get different females for him. The male axanthic and the two hets are a good place to start, though I feel the need to point out that all you will get from these snakes are normals, het and poss het axanthics, axanthics, and axanthic spiders. Not bad, but personally I lean toward more variety. If he has an axanthic something male I would spring for that instead, as the more bang you can get in a male the better. An axanthic pastel, for example, would give you pastels, axanthic pastels, spiders, axathic spiders, bumblebees and axanthic bumblebees when put to the spider (with all non axanthics being het). Better outcomes and better value.

If you were able to get a male with more than just axanthic, I would say the two females you have would be plenty to start with. Sure you could get a third or even fourth females but it may be best to ease into this. You can always get more once you feel comfortable in your setup, so there really isn't much of a rush. If the axanthic male is all you can get on the other hand, I'd scrap the normal het female and pick something else. Paired to a regular axanthic male half of what she throws are going to be normal het axanthics, which you as a new breeder may have trouble selling.