I have consistently higher stales than the pool. Today I mined my HD8650 for 8 hours non-overclocked (so at ~210Mhz instead of ~250Mhz) and that did not improve it any. On average p2pool reports ~16%+-16 while the pool is usually about 8% (today it even reported 23%+-23% !)

Is there anything I can do about this?