Actually you might want to consider changing the arm. I have had several Alphasons ( HR100S ) - they are very smooth by nature. Outstanding arm, but if you want more punch you might be better off with a Linn arm.
With regards to the Soundsmith Paua - I know this cartridge well - its very smooth - probably not going to give added punch.
The Dynavector XX2mk2 mentioned above is quite punchy in the bottom end.