Hmmm, when we had it installed outboard it hit the headrest, not the window glass IIRC. That's why the install was so upright. It was a great install, just way more upright than most. I wouldn't be great for a younger child, athough I fiddled with the position of the base some and got it not so upright.
We only had the WZ in the center once or twice and I think it might have thouched the glass. It was actually the primary seat in our other two vehicles and I had a different seat installed in the tuck except for vacations when I wanted the WZ because it was more comfy. My sister was also with us, so that's why it was outboard.
We did have the Radian in the center in the truck and it fit GREAT! DD wasn't so high up and had a lot more leg room. That's what we used for our vacation this year and it worked out great.
I never tried the YS in the truck because DH traded it in on a crew cab just before I got the YS.
Our normal seat in the truck was an Evenflo Chase. While it's not the quality of Britax, Radian, or Recaro it does install well outboard OR with LATCH and fits DD well. It doesn't touch the glass at all.
ETA: I see you have a Radian. Could you switch the seats in your two vehicles?