Steering tight after replacing ball joints

Hi all. I have recently replaced the n/s upper and lower and the o/s upper ball joints on my p38, o/s lower done last year. However since doing so the steering is quite tight and tends to not self centre. Has anybody else come across this?
Managed to borrow LR tool to replace them.

Have since replaced the radios arm bushes on both sides and swapped it back onto the original 16" wheels, this has improved it but still twitchy when you come out of a bend and have to drag it back straight.

Any input appreciated
Thanks

I would say have the tracking done by some one that knows range rovers and it should improve