TKI3 knuckles gives you more steering than the TKI4 knuckles because of the different ackerman. The easy car to drive is the TKI4 With TKI3 B-plate
Just because the 3 knuckles gives more steering doesn’t mean it makes it harder to drive. The 3 knuckles combined with the 16 degree hubs feels the best for ME. He can easily try both and see what’s best for him. My smoother feel reply was more towards the 16 degrees opposed to the 13 degree