yeah i have an esp floyd rose too. It can be a bitch to find the right allen wrench. I forget exactly which one I have been using. like 3mm or something. the other thing is they strip easy so yours may be stripped. Make sure you use a size that fits perfectly otherwise it will when you put pressure on it and strip the head. I think I found that 1/10 inch and 3mm work well. also it is beneficial to cut of a bit of the short end of the wrench. At least with my guitar it can be hard to get the wrench into the head straight without doing that, not getting it in straight is another great way to strip the head.

It's kind of a bad design, but my bridge stays in tune pretty nice so I am nt gonna replace it, but as far as adjusting it and changing strings, it is always a bitch.