L322 Harsh ride??

So my new to me L322 seems to have a harsh ride compared to my previous car, both are 2004 TD6 cars, I’ve swapped the wheels over to my new car so both were running the same wheels.
I read it could be a compressor issue and as the suspension took a little to long to raise I decided to swap it with the compressor from my other car that I had recently replaced the piston ring on and it had worked well.
That done, suspension raises quickly but ride is still harsh.
Any thoughts? I still have my old car so can swap any parts that I need to if it’s likely to fix the issue

No leaks in the air bags? Damper not failing?

No leaks or fault codes. Suspension stays up and appears to work as it should. Just seems a harsh ride especially at speed. Not so noticeable at slower speeds.
How do you test the dampers? I guess it’s not like the old days where you could bounce on the car and tell if it bounces repeatedly

It could just have harsher dampers in it or maybe some poly bushes have been fitted?

Hmm hadn’t thought about the poly bushes I’ll check tomorrow, tempted to swap my old dampers, I prefer the smoother ride so might be worth a try, I imagine they aren’t difficult to remove/refit? Especially if I just do the rears, can they be tested once they are off?

have you checked the obvious Tyre pressures

Yeah tyres all equal pressure, and off the old rangie which drove ok

I would check for poly bushes

Easy enough to change, 6/7 bolts i think bout an hour if not less. Though you should read up about it as the air bags must be deflated first.

Could that cause a harsh ride though? I think check for polybushes first will be the way forward

polybushes give a harsh ride as they are stiff not soft like rubber. i only ever use rubber for all mountings and so on.

The front suspension units on the L322 are 'all in one' of air bladder and shock absorber....you can just change the air bladder over, but you have to dismantle the whole shock/air bladder assembly to do so.

Yeah I replaced the fronts on my old one, are the rears easy? It’s the rear that feels more wrong/different on the new car