Dear Tiffany,
I can't tell you how much I appreciate you taking the time to thoroughly answer my questions. I'm sure you can appreciate how much I wanted to get this right... My daughter's safety is so important to me!
The website you sent me was very helpful. I learned that I do indeed have switchable locking retractors for all three seats. I went ahead and twisted the buckle strap for the lap-shoulder belt of the center seat to shorten it, so that I could buckle the seat and use the lock-off (otherwise it was in the way or had to stay open), even though the switchable locking retractor is serving the function of locking the belt in place. My husband and I got the seat as tight as we possible could using just the belt, but it still shifted some at the base. We then attached the tether to the strap
Britax provided, which we had attached to the bottom part of the driver's seat which is bolted to the floor. (Sorry, but I can't describe all of this without run-on sentences!
After tethering it, the seat doesn't move at all! The angle is between 30 and 45.
Thank you very, very much for your time. If you have a boss who I could thank as well, I would love to.
Sincerely,
A happy mom