I have been running BiaB under Parallels for many years (even though I recently switched to BiaB 2016 Mac version). I used an external USB audio & Midi interface with corresponding ASIO drivers, without any latency issues.

If you are using the built-in sound card, it is most likely the latency from the Windows MME audio driver that you hear. Using asio4all might lower the latency, it's worth trying.

Hope you can sort it out!

Regards
/Björn