Yes, 200-250 is the evil frequency! ;-)
Muted attack of the flatwound would need MORE compression, since it is biased toward a heavy attack and NO sustain.
I'm trying to help this guy out. You obviously already have the sound you want.
Too much signal processing takes the magic out of the players hands and gives it to the engineer. Your choice;
I'm a musician and an engineer, so I have an objective perspective.
I think we're going to have to agree to disagree here, mate. My experience with flats clearly differs greatly from yours. That kinda sucks, because they fill a great tonal niche if you have the right feel for 'em. You definitely can't play the same way you do with rounds, though.
That being said, though, this is the recording gear sub-forum. We're not talking about the magic of bass here. We're talking about engineering and production. So take off the "processing makes me sound like a robot" hat, put on the "where the hell is my LA-2A?" hat, and think outside the box for a bit. There's more than one way to skin a cat, they say. What calls for rounds and a 250Hz cut for you, might be flats and a 350Hz bump for me. You never know!