Are the amps fused themselves? Don't use a fused distribution block if your amps have onboard fuses. By adding more fuses you will also have a voltage drop with each additional fuse.
And are those Max power levels?
I'm running a T757 (750W max, or about 300W continuous), an F407 (140Wx4 max or 75W continuous), and a QX2180 with a 100A fuse
The amps are 40A, 40A and 20A respectively and so far I haven't popped the 100A fuse or come close to building enough heat to start a fire.
I ran the same thing through a 60A fuse and never managed to pop it either.
