Gig, like Alex said, you could remove the dead leaves and bury the stems deeper into the soil so that the rosette could be closer/level to the soil level or pot neck. Personally, I would cut the rosettes off the long stem, leaving a little stem and just wait till the wound dries and push it back into the soil. Roots will form to anchor rosette into the soil. If at weird angle in the pocket to stay in soil, use pins to anchor rosette till roots do their job.
I'm a firm believer in rotating pots to get more even exposure and growth. Makes a difference in the way semps look.
Not all sempervivums grow at the same rate, thus some reach to a longer stem than others. Some have short fat stems that aren't so long. I'm amazed at the diversity of semps regarding not just leaf shape, color, and thickness, but differences in fatness of leaf, root, stem and growing patterns.
