I'm in the same boat as yourself, I have an ~1100gram 7 month monster female spider. She's a beast... I'm thinking of pairing her to my lesser in 10 months or so! Both will be good by then I think.
Wow, that really is a big girl! Sounds like she's a bit young to breed though? I think it's safest to wait until females are 3 years old before attempting to breed them.