Thanks for the warm welcome everyone. After a few road (& load) tests I'm of the opinion that even though one shock isn't right, the pair of them are simply inadequate for me as a rider. I like to push the bike a bit and I'm essentially riding two-up all the time due to my height & weight. So a heavier duty set are winging their way to me as we speak, and will be fitted as part of the first service customisation. I'll be sure to post a picture of the work once it's done.