DS is currently in a Joie iSpin 360 and whenever we are driving somewhere he complains constantly about back pain. He used to find the car seat very comfortable so I assume he has outgrown it. He is a high percentile child, 3 years 9 months old and weighs 19.7 kg at 107 cm, so he is above both the weight and height limits of his current seat.
Does he need a high back booster, or are there any other forward facing options? I do not want an ERF car seat, he has been FF for a while because he gets car sick and there is no going back to RF. Which car seat would you recommend for him?