I dont use the poclbm kernel, I'm using poclbm miner with phatk kernel 
Run "git pull", it was included recently
As of the clocks, I'm on 1000,350 now. There is no aggression in poclbm, I use -f0 which is the hardest setting, -w256 and -v
Running headless means I simply run "xinit" which spawns an empty desk with one xterm window in case of ubuntu server. I didn't change anything config related, except for having "export DISPLAY=:0" included in my bashrc file.
Run "git pull", it was included recentlyAs of the clocks, I'm on 1000,350 now. There is no aggression in poclbm, I use -f0 which is the hardest setting, -w256 and -v
Running headless means I simply run "xinit" which spawns an empty desk with one xterm window in case of ubuntu server. I didn't change anything config related, except for having "export DISPLAY=:0" included in my bashrc file.
Ah. I see. I was confused because phoenix comes with two kernels, called poclbm and phatk. I guess poclbm also refers to the front end. I'll also try some 'harder' aggression settings again (was using AGGRESSION=13 until recently).
I have only one possible tip: Add a file '.xinitrc' to your home folder and simply put in the one line 'cat'. This will simply wait for input and could be considered a slight improvement on running an xterm. This almost certainly won't affect hashing rate but might affect stability a tiny bit. Either way, it seems neater to me.
Are you doing anything special in xorg.conf? I don't really know what I'm doing in this file. I don't think I've made an impact on jitter, hash-rate, or stability yet but it's hard to tell with stability.