I have just replaced the cartridge on my Aqualisa shower in order to stop an annoying drip from the shower head. origionally the shower was a gravity fed system. we changed over to a combi system a couple of months ago, since the we lost treperature control (i.e. the shower was miles to hot to stand under) when I changed the cartridge i chose to replace the grey gravity fed cartridge witha pink combi replacement. I have fitted the catrridge exactly as instructed including carefully replacing the 'O'ring, but we still have very little temperature control....anyone help please?