your equipment
Your Equipment seems pretty good, Audio 8 and the Faderfox are awesome and I used to have an scs3d, it really is a good controller, trust me (many dislike it without having used it, don’t listen to them).
the usb problem
I don’t think 2 USB ports are enough, I need at least 5 Ports (for: Mouse, Keyboard, Numark TC, Audio Interface, External HD), and as my Laptop only has got 4 I am using a 4p USB Hub where I put the Mouse, the Keyboard and the Numark TC on to (the one left directly on the laptop is for mp3 players for wishes etc.). Midi signals transfer without any loss or cons through the hub in my experience, I even used to have all my midi equipment connected on the hub (keyboard, NTC, scs3d, ps2like gamepad).
the knob on fdj2 tragedy
Dunno, I never used it only heard that it’s ausum :F
I’ve used a powered D-Link four port hub and not had signal loss or any noticeable latency before when I was using two padkontrols, a VCI-100, my Audio8 and an external hard drive on it’s own power source.
I gave it back because I decided rather to do some saving for an Electribe SX. I mapped it to be kind of a looping machine, everything was running fine, but I think the Electribe solution is better.