There's always room for improvement. These new version filters are pretty good, but not perfect. The constants are your 'tuning knobs' if anyone would like to dial them in further.
I need to reiterate again (in bold this time), these new filter versions severely bog down the scanner on loading large logs. E.g. if you've got a 20+MB log, you're best to go boil the jug and make a coffee.
There is nothing wrong / defective with the old version filters if the bogging down pisses you off.
They are an alternative, not a replacement to the old version filters.
Happy tuning you lot.