CDG Terminal 2E

That is doable if your flight is on time.
Probably ask the airline about the hall?

They could use all of the above. For example tomorrow the flight to ATL is departing from Hall K, while the one to DTW is departing from M. You can check here but only the day before.
http://www.parisaeroport.fr/en/passengers/flights/flight-departures/informations-flights-departures

But the bigger issue is: Why do you stress about it?

I've missed my connection at CDG (going to Florence) so many times I can't even count.

Air France will simply put you on the next flight to Rome if you miss that one. There are 9 departures a day to Rome with Air France or their partner Alitalia, and 6 of them on codeshare with Delta (Delta, AirFrance and Alitalia are all partners in the SkyTeam alliance).

Just enjoy some drinks at AirFrance's expense while you wait.

Actually if you fly Delta, maybe AirFrance won't pay for the drinks. Oh well. Take some euros with you and pay your own drinks. They've got plenty of champagne and cognac at the bar at 2F .

Thanks so much for the great link! And that's what I do...stress! lol I'm definitely a worrier. I bought a group tour beginning at 6 pm in Rome so that's the reason I'm stressing a bit. But as my friend said "There are worst things than being stuck in Paris for a few hours."

It's a doable connection. To speed things up, when you get to passport control, ask the staff member at the 1st class/business class line if you can use it because of your connecting flight. I've found that if you ask politely and show your bordering pass, they will let you in.

It's on a single itinerary so if I do miss my flight, the Delta/Air France will get me on the next one...at least I assume that's how it works.

Thanks for the tip, T...I'll do that!