I've been testing out several Arcus bows (T4, T5, and M5) and have really been enjoying the feel and lightness of these CF bows, and the fairly rich sounds they pull from my main violin. However, I've noticed that bowing with the T5 and M5 bows cause a light buzzing/vibrating/scratchy sounds, more so on the G and D strings than the A and E strings. The buzzing is more noticeable on the T5 than on the M5. I don't hear this on the T4 oddly enough.
I don't hear this noise/sound when playing with my wood bows or my Presto Impulse bow. I've also made sure to use the same rosin on all the bows, and the sound still remains on the T5 and M5 (again, more noticeable on the T5).
Does anyone have any thoughts on what may be causing these sounds? Arcus describes the T series bows as stiffer than the M series -- I don't really have any expertise to analyze this, but I wonder if that may point to a possible explanation given the fact I notice the sound more on the T5 than the M5 (though I don't hear any of the buzzing with the T4). Could it just be that the bows simply are not a good match for the violin?