This is exacly like my situation.
My XP has DS 2 nights every week (same 2 days). He has done since DS was 10 months and we split. It doesn't seem to have done DS any harm? certainly i didnt know about the 'under 2' thing..
Maintenance wise - I am entitled to 15% plus £5 a week (random) which was recommended by a solicitor. BUT XP actually gives me nearly double that!! Simply because he got a great mortgage and so can afford to.
We went to see a solicitor as we were unmarried and XP wanted to sign the parental rights agreement (giving him equal rights) and I agreed, as altough it takes full control away from me, it is fair. And XP, like your, is a wonderful dad, more than competent and would also take full custody if he could (but he wouldnt take him away from me!)
I would recommend seeing a solicitor, but like you, i couldnt get legal aid and so it was pretty expensive!! Good for peace of mind.
Also - we have worked out our maintenance
ourselves, didnt invlove the CSA. Mush more amicable and friendly, and totally fine if you can trust your XP.
Maybe you could talk to him and try and do it that way? Surely he would want to give you what you need for the sake of your child.
And XP'd family live abroad and I let him take DS over to visit as much as he can, (usually about a week or a few days every couple of months) As they are every bit as important to DS as my family are, IMO.