it's a common misconception that you must have equal tyre pressure. if you factor in that your car weighs next to nothing up front and you have 26psi of pressure in them you can see why you have a hard ride. most modern FWD cars have similar sized front tyres and they also deal with the weight of an engine.
the VW pressure specs for front tyres (even with the VW GT rim on radials) is what i mentioned above.
i've been running that pressure in my beetles for 11 years now and i've never had an issue till today. try it and let us know your feedback.
PCDs can be changed, infact i too had the wrong ones before i swapped my rims to 4x130 ones (old was 4x100). more importantly you must get someone to measure your Offset (ET) with a vernier caliper so you can see if you are within the manufacturers specs. if your offset is wrong you will be overworking your wheel bearings, steering components, drivetrain and suspension which will cause a harsh ride.
you could also have a denter check your chassis for flex. as a car gets older it suffers from metal fatigue due to all the forces being applied to the car over it's life. now if you fit heavy wheels and tyres (and in my case stiffer suspension components) then you cna expect the next weakest link in the chain to suffer,.. in this case it's the chassis.
many people who "upgrade" their cars fail to realize that when modifying one part they must address many other parts otherwise they will be compromising for the "upgrade" somewhere else on the car.
in my case i MUST fit a strut bar up front as my suspensino towers need alot of help to stay straight (without it my suspension geometry changes on hard turns liek most other cars). ideally, since VW type 1's are so flexible, we all should have roll cages as well to make the suspension absorb bumps rather than the chassis,.. but that'll never happen in a real world application.
sorry for the long reply, just adding a bit more info to help you as much as i can.
