@arachnoxious good luck, pairing usually is quick and to the point....If it's not, the female may not be in position to be receptive. This is one species where females love to grab males when they pull out and eat them.....but I've gotten a sac pretty much every attempt.
They tend to drop very quick, the eggs develop quickly and females often double clutch...so when you take a sac, you always want to offer lots of food shortly after.
Don't worry about me, it's too cold to ship anyway and these MMs don't always have a long shelf life. Best of luck!