Serene,
I'm pretty sure CRA only cares about a single paragraph of very specific wording in your separation agreement. Sending in all that other crap only annoys them.
Find out what that exact wording is. Either from asking them directly on an info line, or asking on here. I think it has something to do with demonstrating that EACH parent PAYS child support according to table income. It's the offset system, but CRA really wants to see more than just that word. They want to see that the person claiming the CCTB is a receiver of CS.
If your separation agreement has the appropriate wording, send them that page with the paragraph highlighted.
If it does not, make a motion to change the agreement to put that wording in. Make sure it's clearly retroactive to a particular date. Then send the new agreement page to CRA and ask that all relevant past tax years be reassessed.
The thing about CRA is that they will only pay out money if everything is just how they like it. Any confusion, and their default is to withhold money. They do this because it's a lot easier to hold back money and give it out later when all the paperwork is correct than it is to get back money that is already out there.
The CRA website / section pertaining to, is very vague when it comes to shared parenting. I did call them and actually got through within secs to a lovely lady who took the time to go over this with me, and more
Yes they want to see the two way exchange of CS indicated in the Sep agreement, but when it comes to claiming dependent, this is the part that they seem to make assumptions that because a party is receiving CS (offset amount), they are the one to claim the dependent(s)