Originally Posted by
scacra1 
He would be a perfect father 80% of the time,
... that is going to get you. And get your innocent child. Having a child is a VERY stressful undertaking, and that's if you have no other issues going on. I doubt that he will make a complete turnaround just because there is a child in the house. Adding a stressor will probably only make it worse.
The "80%" that you write about will be way overshadowed when the ugly 20% rears its ugly head. Please don't bring an innocent human being into the World when you have so many doubts...
Just my opinion.