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Swisstop BXP on the new caliper.
I had been running just some standard cheap road pads on the old caliper.
I've got the double wall rim. Rim might actually make a difference... I noticed that this new caliper doesn't have a ton of clearance on the rim. Like, it doesn't open very far and you can actually see in that photo that I've moved the concave washer that should sit inboard of the caliper arm to outboard just so I could fit the bads between the caliper arms and the rim so I wonder if the single wall rim is narrower.
I actually have another wheel with a single wall rim so could try swap it...
Swissstop or koolstop ;)
Found cleaning the rim surface helped, do you have single or twin wall rims? Wonder if that makes a difference.