Been watching as well. I use a 21 day moving average. PBL looked due to retrace toward the average eventually - it was looked very over-extended when it topped briefly yesterday at $10.75.
I don't think its quite time to go short - full year results out next week Thursday 28th? I think.
I think there will be a time to go short soon though - it can't be propped up forever - maybe after the full year results wear off.
Cheers,
Christian