With upshifts on the FBM you can 'preload' the shifter. Press to change up a gear (then hold) while holding full throttle, and it will stay in the gear until you lift off the throttle, at which point it will shift up. This eliminates the timing issue, all you need to do is make sure you lift off the throttle enough.
For downshifts, using auto clutch, I find I'm not too good at getting the timing right with the blip on the FBM. Is anyone else just not bothering to blip on downshifts with this car? I find as long as I choose the point when I shift down carefully, it's not a problem.