Fixed Gear Disc Brake

You could also try front & rear normal road brakes (OMG!), because im guessing a rear brake came stock on you fuji anyway.

@oz., due to traffic and pedestrians I often have to slam on the brakes to avoid imminent collisions. Worried they'd be too good
I think you already know that "slamming on" any kind of brake isnt always the fastest method of stopping. Especially if most of this "slamming" power is coming from the front only.

If its dry weather, your normal road brake should be powerful enough. If its wet, then a harder squeeze although seemingly necessary can also lead to the front tyre losing grip. A front road brake is just weak enough that this doesnt happen too easily, but if you get a much more powerful disc brake you may end up experiencing this.

So you come back to "not squeezing hard" when its wet (to prevent front wheel slipping) and "not squeezing hard" when dry (to prevent endo's) which is all roughly equivalent to having stuck with the normal road brake and squeezing harder.

Im sure you can (and already do) achieve optimal stopping with a combination of road brake + fixed wheel skid stops. I doubt having the disc brake will mean you have to be any less cautious or skillfull to achieve optimal abrupt stops. But from a maintenance stance, the lack of rim wear and much slower pad wear with a disc brake is obviously a major bonus.