I never thought I'd say this, but the amount of stuff you break with the item causes ridiculous SFX, rapidly. Make it so there's just a chance to play the AuxFX, instead of every time.
Instead of messing with block breaks, I made the break effect more graduated (hopefully). This should pace the break events to be a little more random/even, and hopefully space out the aux fx.
I never thought I'd say this, but the amount of stuff you break with the item causes ridiculous SFX, rapidly. Make it so there's just a chance to play the AuxFX, instead of every time.