Okay, Arnaud, how about me? I'd really love to make it through the qualification round at the US Open, but I'm too slow now to make it, most likely. My actual averages are a little below 3:10, but when I take splits, it slows me down (I think it distracts me from lookahead on the next step. I recently did an average of 10/12 with these splits:
60
91
47
(total 3:18, so probably close to 10 seconds worse than my normal averages)
You know I'm pretty slow at 3x3x3; I figure 47 is pretty reasonable given my 3x3x3 speed. And apparently from your numbers, my centers aren't so bad (although I feel like I'm not very good at them, and take way too many moves to get them done). And you've seen that my move counts for edge matching aren't much worse than yours (a little worse, but not much). So it seems like my best bet is to improve edge matching lookahead.
It seems like I will do great on 3 or 4 matches in a row, and then hit one where I just can't find the piece. I'll look right at it 3 or 4 times before I finally "see" it. It's like a temporary blindness. Any suggestions on how to overcome this? Whenever it happens, I figure it costs me 5 to 10 seconds - about 3 or 4 seconds to find the piece, then another second or 2 for breaking my rhythm, then usually a few more seconds on the next one because it takes me a bit to get back into looking ahead. When I have sub-2:45 solves, they're generally cases where this happens either not at all or just once during the solve.
Any advice would be appreciated; I've been stuck around 3:10 for quite a few months now.