I have to say, I've only changed from the original rear shocks in the last year or so and I was hard pressed to tell any difference from the driver's seat.
I expect you, of all people, to be trying much, much harder
Can I point out Mr Wood has a car knocking on the door of 200k (least I think it is!)
Perhaps it's just driver error, blaming the shocks.
By the time mine reached 200k, it was on about its 4th or 5th set of rears. And as many springs IIRC, but most of that was due to a stint of KYB springs that often fail to last the warranty period
Fronts fair a bit better for me, I think it was scapped on its 3rd set, but they were changed prematurely always for handling reasons, in order to dial ut a bit of that god awful high speed understeer that all Omegas suffer. Never broke an Omega front spring either, only changed to Irmscher for handling reasons.