any basic air system can only put the same psi in each bag. if the corners of your car [assuming you have four corner split which is pretty basic with air!] are different weights they will lift at different rates. That isnt a "fault", its physics. [hydros are just the same but it all happens so fast you tend not to notice
]
you can overcome this to a degree for the road by lifting all the way then dropping to the ride height you want.
If you have 3/4 lines then they are
way too big without nitrogen. The volume needed to fill the pipes is what is causing your imbalance to be so noticable. either go down to 1/2" or move the valves to the bags rather than having the at the tank [this also gives the benefit of the pipes acting as extra storage plus you only dump what is in the bag each time].
If you have a "bigass" tank you should have at least 2 100% duty cycle comps, partly for filling but mainly as the comp will burn out in no time if it has to run such big cycles all the time.
desribe car and system a bit more for specific details of what you need to do.................
