How big were the females 3 months ago when you started your pairings?
If they were way smaller and just are now getting up to optimum size I would give them another month, if then you still have no result I would replace the male.
They were about the same size. It's like they hit a growth "wall". But they were anywhere between 175-225 grams.
Balls:
1.0 '13 Fire Yellowbelly
0.1 '13 Enchi Spider het. Hypo
0.1 '12 het Clown
0.1 '12 het Hypo