It's also nuts how differently envelope filters (well, any pedal for that matter) work better with some basses than others. I absolutely love the synthy phased sound of my Bassballs on my P with flats (trim pots turned down and sensitivity low), but it sounds anaemic and tacky with my other basses. The only exception is the original FX25 which makes everything sound amazing but I'm aware of how massively polarising that pedal can be!
I'm reminded of some advice written elsewhere by a well trusted source - 'play the filter'. There aren't many filters that sound perfect whatever you do with them, or that don't need some special consideration to get the best sound. And that, of course, is a moveable feast at the best of times.
Maybe give us some examples of sounds you like? 'Keeps bass in the signal' is misleading, because mixing wet and dry is one thing, BP and LP is another, and each work equally well depending on other things.