Trouble removing bottom bracket
Park Tool list the BBT9 as the tool to use for both Shimano and FSA external bearing bottom brackets. I would see how tight the wrench fits on your new Shimano bearings. If the fit is as loose as on your FSA I would replace the tool so you don't strip the notches off your new bottom bracket. While the type of wrench with the open side allows tightening the bearing with the crank in place it is more prone to spreading than the type that forms a complete ring around the bearing.