similar experiences here... only exception.... my strings needed a bit longer to stretch out..I finally got my strings, it took 6 weeks due to the holidays and the pandemic. They replaced a Spiro Mittel E and Flex Deluxe A D G on my bass. The G and D strings are a bit thicker so I widened the slots on my bridge, not too thick though, feels right. My first impression was how much louder my bass got. The tension is noticeably lower and it feels great in the left hand, I can also feel the bass resonate a lot more, and again.......much louder. If I had to put a number on it I would say about 20% louder both pizz and arco. Someone mentioned the knobby feel because of the weave of the strings. I concur, it takes about 5 minutes to get used to, it actually feels solid and non slippery but certainly not sticky either. After four days of playing for hours and hours now when I first pick it up in the morning it's still in tune so it's stretched out. Strong, thick fundamentals so you can really hear the center of your pitch, again both arco and pizz, however this will expose your intonation. There was never any banjo new string sound and it's settling down nicely. The sustain is perfect, just enough and I hope I won't lose too much of it as the sounds darkens. Jazz pizz for the right hand is about as easy as it gets. The bow response is immediate and very dynamic. You can really dig in or play pp, it's all there. Still a bit screechy on the open strings but that's getting better as well. I will wait out the full two weeks before I adjust the sound post. It might be fine but coming from a Spiro Mittel E, the lower two strings seem not as lively as the top two. Not a big difference but I may need a small adjustment. One major caveat! These strings will not mix well with anything else. They sound and feel very different from all other strings I ever played. I hope they'll stay solid for a long time but if you break one you're screwed, so I just ordered a second set. If that's not an endorsement at these prices I don't know what is!
And beside the impressing arco skills I'm still deeply impressed by the pizz sound and volume... Only problem: I recognized the need to get a new dressing of the fingerboard because of the lower tension and bigger amplitudes of the strings..