You are ripping the stems? It doesn't sounds right for the tire not to move and still rip your stem off. You are certain your spokes are nice and snug and not piercing the tube? I usually don't tighten down my stem nuts so that the tube can move a little without damaging it. I notice the tube will move more but never breaks the stem. I will just tighten the nut up against the stem cap just to keep the cap snug. Hope it helps.
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