pulling to the left, well that ain’t right
over what distance? What does ‘feels hydraulic’ mean?
If not air pressure, toe adjust, or the crown, I would wonder you have some tire to tire variation in either the carcass or ballast (if applicable).
do you notice when mowing or off pavement applications?
General speaking in low pressure applications a slight variation in tire pressure makes a huge difference (ie atv…sure tractor is higher pressure, but it’s not car / truck tire pressure).
I would suspect tire pressure or toe adjust, but I also really wonder in distance traveled to notice a pull vs accuracy of the steering.