I will try to fly the same route in june (yes, let us know about Armenia).
GP net is very accurate about the loads if it is green, it is open and yellow is quite a good chance.
CDG is a quite mess for everybody specially in summer or during French holidays. I go through there six to seven times a year.
Non reving is not more difficult than anywhere else.
Regarding the transit area it depends on the terminal and the gate I think that unfortunately there is a great chance that you will have to leave it. Custom and immigration can go fast security can be a nightmare. 1h30 minutes will be cutting very very close unless DL departs from the same Terminal in this case you might have a chance.
The arrival on AF will most likely be on T2E what about your flight on DL?
Sometimes AF give seats after they close the flight sometimes they give you a priority verification which will allow you to go through security and they will call names at the gate. If the flights are wide open, they give you the boarding pass right away.