Expecting our 3rd child any week (or day now). I've switched from using latch to seat belts for my sons' RF Graco Fit4Me and Harmony Defender 360 booster in preparation for the 3 across. In doing so I've gained several inches in the middle for the new infant seat. However, because the RFing seat has moved over a few inches, the way the Prius' backseat is contured (it dips down) it is causing the RFing seat to tilt (towards the middle). Is there any way to correct this tilt? Can you put a noodle or angle adjuster under only half the car seat (perpendicular to the backseat on the side where the backseat dips down)?