My 2013 Fuji Touring has Tektro cantilever brakes. They're working OK but it is very difficult to disengage the brake assembly to remove the tire. When the cable is properly tensioned I have to squeeze with both hands to get enough slack to get the cable loose, when I adjust to give myself some more slack the brakes have too much play in the levers. I'm a big guy so upgrading to better brakes is probably a good idea anyway. Can anyone make a suggestion for an upgrade?