Once audio is sent to the PowerCore and processed, it must be loaded back into the host applications sample buffer. This adds an additional degree of latency. For lowest possible latency, set DP's hardware "Buffer Size" as low as possible. *(CPU load will increase as buffer sizes are lowered. Use Performance Monitor window to monitor CPU load)
Another solution is to nudge audio (on the track using PowerCore) forward to compensate for latency. this can either be done on orignal take, or the audio can be bounced to disk. Then the bounced file could be nudged.