Even when the led's go red to blue and the hopper is 'ready', the description of "at temperature" is not a static state, it is, I believe almost continuously monitored and cycled on/off very frequently depending on draw, etc., but meanwhile, the light stays blue rather than flashing. And the clicking does seem to continue. I've noticed it louder and softer at different times. Wife and I have both noticed that, as you draw, if you touch hopper to a front tooth, it really amplifies the click...in your head!
I've also had it happen that my Ti stopped developing heat, though the clicking was still happening, albeit slower than usual. New body fixed the heating trouble.
On the back end heat topic, I have not had improved back end heat from cleaning threads. The SS I have has had hot back end for a while now, I just haven't made much issue of it, and I don't notice any different performance from a Ti, which gets hot only when the hopper's on for a minute or two. Threads do get clean and smooth with Stik Tac, and though I've not gone to the Deoxit route, I really don't think there's a conductivity problem, it's something else. The Ti seems now working well after two new bodies, so maybe I have confidence to take up the hot SS backend with HL. Just been giving them some time too, maybe for improved design or whatever.