If it were my project I would use 2 or more piezos. At least one for soft taps and one for hard taps.
Each with its own conditioning circuit for it's range.
Taking the example from Taiko Trainer (LM358) link I posted above, I would go from there.
I have quite a few different piezos hanging around and have been able to get a nice pulse on a few that I tried using variants of those circuits.
Also, I would test the conditioning circuit while someone is dancing and make adjustments according to those readings.
Are you using a breadboard for the conditioning circuit? Cleaner readings from PCB board.
Are you using a plain flat disk piezo? If so what size?
I tested on breadboard , but soldered it for the show. My piezos are basically these flat disks but they come from Yamaha DDrum 50. These just sound better comparing to all the other various piezos I have around.
I had the same thought about two sensor pairs. So I shall try that too. And I have collected all the parts for the filter so the testing is in the works.
On stage adjustment I would like to have a pot somewhere in the circuit. Can you suggest where?
What do you think of my sound wave test - is it accurate in a sense?