I am wondering if anyone has successfully installed car seats with a top teather. This loop system is really strange to me, I've read the manual.... No matter how tight I tighten the latches they still pull sideways when tightening the top teather. I'm really seirous about proper installation, fire dept never seen any system like it, dealer won't touch child's eat installation with a ten ft pole.... Anyone get them in straight and tight and safe???