As I said, I get very even and satisfactory response using the Innovation black fiber strings, and the metal wound B is virtually the same. So, other than the look, I'm very satisfied.
I understand your feelings about wanting the other band mates to turn down. Unfortunately, it probably won't happen! Again, this is why I have two different basses. Amplified, they both sound the same, but acoustically one can easily understand why there is a $10k difference in the price!
What pickup are you using on your 404? When I first started playing upright, I started with the DeArmond Transducer Pickup, This pickup gave me a lot of feedback, so I began using the Underwood pickup when they first came out. I have tried many, many different ones since then (& some that were very expensive!), but never found one that had a better response until the Fishman Full Circle came out. I have now moved to that pickup exclusively. (although, I had one crap out on me last month!) However, using this pickup, and having my Acoustic Image amp on flat response, I get the natural sound of my bass, but much louder than the acoustic sound.
The guy that developed and made the Underwood passed on a few years back. However, his wife continues to sell them @
Underwood Bass Pickups. Also, I found that there's a copy by Shadow Pickups, the SH950 @
Shadow Electronics.
I suspect that any of these pickups will work in a very loud environment. Of course, the only absolute anti-feedback certainty is to go strictly with a magnetic pickup. But, that sort of defeats the purpose of having an acoustic bass!