Relax. When you miss a shift be sure to go up not down a gear. What happens is the tranny starts to slow because the clutch is in, but the gear dogs are not lined up. Now when it gets back to mesh the large engagment teeth slam into the selected gear. One or a few of these ussually isn't problem. However all it takes is one severe engagment and the edges of the dogs get rounded. Usually the tranny will pop out of gear or not engage. Your weak clutch could only happen in the gear range the miss shift occured. But that would indicate something broken like a shift fork ear. Drain the oil and look for metal pieces. maybe your just being uber sensitive because you heard that bang.