Dave, the transfer from Plovdiv to Pamporovo is only 90 minutes.
You collect your ski's the following day, and all will be explained by your rep in the morning..
Forget the Malina bar, just grab a taxi and head for BJ's. Just ask the driver for the Perelik Hotel. Ensure you agree a fee first of no more than 10 lev. If he asks for more just walk away and he'll soon agree. BJ's will be open until at least 4am.