The arm traps are good for stopping punches, but I'm one of the type of players you're describing and as soon as someone arm traps me, I start thinking about the strikes I'm throwing.
I think the problem you're having is to do with ground stats and possibly stamina. If my stamina isn't majorly impacted and you arm trap me, I can still keep top position, I just need to be quick filling the meter. I believe you'll only manage to sweep if your fighter has significant ground stats or stamina advantage. My advice would be to let them expend more energy before you trap the arm - but this risks taking more hits.
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