Sounds like you had a busy week away from the family. Hope you got to enjoy yourself some while you were away.
H & I were having some trouble with the "family time" thing and have now started to have D4 separately on certain days in addition to some family activities. I find it much easier on me to have this scheduled and limit the "family time" as H was using the "family time" in a manipulative way. IE coming up with things for us to do under the guise of it being "family time" and what he was really doing was trying to get me to spend more time with him than I wanted or needed. Its not easy to balance and I know from listening to my own H that he just wants to spend any time possible with me to show me all of these "changes" he is making. I think it would be a step in the right direction to pre-schedule time with the kids. Also, I know you like being around for the children but this isn't giving your W enough space to miss you and you do need this to happen to get her back.
I also agree with Nomo, that buying a new place right now probably isn't prudent. It may give your W the idea that you are moving on and not committed to working things out since a purchase is permanent where a rental is not. Just my 2 cents.
Me: 30 EX-H: 37 DD: 5 Separated 6/07. MC for months, EX-H quit MC. Divorce Final 8/14/08. Trying to move on with new life.