Floyd Rose Intonation

Hello all,

I was trying to set up the intonation on an ESP Horizon, but I can't seem to get the saddles to move. I've only used non FR guitars before and seemed to manage OK. I started with the low E string and found it was a bit out and wanted to move the saddle further away from the nut. I used the hex key to loosen the saddle (I loosened it quite a lot, but didn't actually take the screw out (if it even comes out)), but I couldn't seem to move the saddle one way or the other. The screw things that stick out from the bridge seem to be only for locking the strings behind the little graphite blocks, so I'm guessing those can't be used to change the string length? Is there a secret way of doing the intonation on a floyd rose? I have seen quite a few videos on YouTube about setting up a FR, but when they get to intonation I can't work out what they're doing.

On a different note (no pun intended) I've noticed that when I depress the bar completely, Satriani style, not all of the strings depress by the same amount. Most of the strings lose all of their tension, but I've noticed my high E string only drops to about the next B or A down (so only about 5 - 7 semitones) which sounds weak . Does anyone with FR experience have any ideas what's causing this?

Thanks for hearing my plight everyone.

Keep on rocking in the free world