18000 shares? Are you sure?
I only get a share about ever 1.5 hours. The share count in your miner isn't accurate, you have to look at the p2pool window.
It's what the ScryptMiner GUI statusbar says, (it's up to 12000 after restarting) but if you say that it is incorrect, I will believe you
The statuses in the Run_p2pool.exe window change so fast and don't make much sense to me.
Note that I have received one payment after over 7 hours of silence. Ha, while typing another one, 1.5 hrs after the last. Still wonder about that 7 hour gap though...