I considered the hyperpro progressive springs for mine, but they were listed for the R not the X that I've got. Glad I didn't buy them because mine already had progressive springs in!
I went with 15w oil and it's much better now
I think his shock was in a bad state, perhaps its lost some of the oil or gas, thus lacking much of the damping. Or it could just be old and worn out. A new stock one would probably be a big upgrade. Setting the sag should tell if the shock is bad or not.
Cough **** Approx £80 per stanchion including VAT. Upper bushes approx £10 each including VAT. By the time all seals and oil are replaced we will be at something like £250. If it was a Honda we'd have just replaced the bushes and have been at £120 all in. Obviously no labour in that as we're doing it ourselves.