I need some help. My 5 year old son is 44.6lb so I need to switch his carseat in my husband's car to seatbelt install (vs latch). Problem is I just cannot get a tight install. Vehicle is a 2011 Pathfinder. I had this same problem in last vehicle (Ford escape but thankfully he was lighter so we just stuck with latch). I'm usually really good at getting really tight installs. I followed all the instructions and all my tricks I've learned over the years. Install is 2nd row behind drivers seat. I did lock seat belt. Did the whole knee in seat while rocking side to side and tightening belt etc. I am really not a fan of this seat at all but he isn't ready for a booster seat yet so I'd like to keep him harnessed another year.