I was dead set on getting my son a Clek Oobr but decided to try one before I spent $300 on a booster. Glad I did! He didn't fit well in it at all and kept trying to slide forward and hiking his shoulders up. I have an SGL here now, but he can't buckle himself because the armrests are so low and by the time I buckle him and do the SG part, it takes longer than a 5 point restraint. My requirements are that it needs LATCH, high back, and not Sunshine Kids. What are my options?