Spirocores are now reformulated, according to Mike Shank. I was just recently trying a different string setup, running Spirocores on the E and A with Flexocors on top. Didn't work out for me, but it's bass issues rather than string issues -- the fiddle seems to prefer the low tension strings, but this is another topic. I first had brought to my attention the new Spirocores by the lady at Ideal Strings. She was complaining about the new packaging, and I thought that it was just this -- new packaging. But, The new formula start out a lot darker, still a little banjo-like. The break in a lot faster. I had gotten rid of the banjo sound by the second day instead of my normal 4-5 days. I didn't hink much of it, but I did notice that they seemed a lot darker with the bow as well as bowing more easily. I was under the impression that my arco chops had gotten better and I was just getting something different out of the string. In discussing the afore-mentioned bass issues with Mike, he told me about the reformulation and that the jury was still out. It could be an improvement and draw players toward Spiros that had formally found them too bright and mean, both pizz and with the Stick. Anybody else run into this?