I see that you are using the stock brushed motor. John Adams (and I ) are using the BL motor. I haven't compared the diameter of the motors yet. Maybe that allows more room.
yes, bl motor is smaller in diameter.
yep that's the issue.... the S60's don't work with the stock motor, unless you modify either the frame or servo case. I just swapped out my S75's from my BL CP Pro and put the S60's in. Haven't spooled it up, but they fit!