I do exactly the same, or almost. I just separate that big spider girl from my lesser male, after a successful 24h+ lock, and I put right after the small male with her to push his buttons. If he cannot do the job, I'll wait 3-4 weeks for retry. I love Leo combos, so I wish the best for your little guy.
My my problem is that particular Phantom spider het OG female is a project animal, and I cannot put an other male with her. She eat voraciously, but no other signs yet, so I hope I have enough time to get the male breeding.
Thanks! I hope the best for you too with the pairingsI'll cross even my hair too for your double het pair.