I want to address your current time splitting arrangement.....it sound very fair.
One thing I will say is that me and my hubby agreed that we would give things time.....not act on impulse. Like my hubby hopes i can give this next try 3-6 months before I reevalutae. For you, for example, right now you are struggling during their time, but you may grow to be OK with it once the newness settles and your insecurities wane....and work out your needs and get them met.
So it sounds like a fair split....if you are not to miserable, give it time to see if your mind can move from what they are doing to things you can accomplish/do/enjoy for yourself. Sounds good right, trust me know it is not easy though.