Modern shimano calipers will have better crown clearance than long drop calipers. See if you can borrow a 105 5800 to check for fit
EDIT: with zoom and enhance it looks like the pads are right at the top of the caliper, definitely try something modern and shimano for better tyre clearance, I'm 99% sure its something they improved with their last couple of generations. Others might know more than me though
Modern shimano calipers will have better crown clearance than long drop calipers. See if you can borrow a 105 5800 to check for fit
EDIT: with zoom and enhance it looks like the pads are right at the top of the caliper, definitely try something modern and shimano for better tyre clearance, I'm 99% sure its something they improved with their last couple of generations. Others might know more than me though