Just going to to say up front, that this is on an old bike, an 85 Schwinn Sierra that I am building up as a light offroad and/or touring bike. The mounting posts have no noticeable wear despite the age of the bike, which is in excellent condition. It's probably never been offroad once since new, it's that clean.
Anyway, just got the CR720's in this week and installed them. I tried a baseline setting with the pads set flat against the rims. On the first ride I noticed no real noise except for the front. There was a slight squeal, but not horrible. What did bother me was the shudder I experienced from the front fork. Kind of spooky, glad I wasn't trying my first 30+mph pavement descent!
So, I say what the heck, and toed them in like I would on any canti to stop the howling/squealing. It actually got much worse. Both wheels are making an awful noise now... Sort of a low pitched groan..
I am going to check the headset bearings to hopefully eliminate that as the cause of the front shudder. But? I guess I should go back to the flat adjustment? Change to Koolstops? I am an experienced mechanic and I have never seen toeing brake shoes inward at the front do anything other than quiet down a canti brake. What would/could help this, other than what I am already going to try, or have tried?,,,,BD