They would not be loose if you tightened them down. Could you expand on why they are loose?
Yes, I am aware of this. I'm waiting for John to return to the states so I can ask about it. My kit came with it pre-soldered. It has black wire soldered to it.
I am assuming you mean a set screw? There should only be 2 in the extruder/hotend assembly. 1 holding the gear onto the stepper shaft and one holding the heat break into the heatsink block. Both of these should have been tightened during assembly.
I don't understand this one. How would an x movement come down? It's a left/right movement.
These can be found in the main FT-5 post here.
On page 14 of the setup guide, it says to set the Y stepper to 1.2-1.4v.