Getting Aphonopelma seemanni to drop a sac

[Donald Lloyd]

I've tried breeding this species a few times the pairing always seems successful but I've never had a sac dropped. with my most recent endeavor I paired them one time on 10/31/16. I tried a second pairing about two weeks later and female was unreceptive and very aggressive towards the male. I've read all the breeding reports but haven't come across any useful info on getting them to drop . Any advice would be appreciated! (temp kept between 70 and 75 degrees humidity between 50-70%).