Newbie here! I read that the Juliet Temple Shocks and Nosebombs have sizes like 15 or 25 or small or large respectively. What does these sizes do to the fit. I know it depends on head sizes, nose features and all. I have 15 Temple shocks and looks like a large nosebomb. My question is, will these sizes help in a more tightened fit? My couplers are tight and are OK. And lastly, can I adjust the stems? I am afraid I might break them. I have a wiretap and crosslink sweep, and I can bend these to tighten the fit. Will it work the same with the Juliets or any other X-Metal frames? Thanks!!!