That's interesting Dick. We have always experienced some of our tried and true areas that were not as good with heavy current (indicator being buoy was leaning over too far) compared to when it had light current. My findings have usually been the following:
Light current - best
Changing current (coming back from high wind push)- very good
Little/no current - good (maybe fish staging for/from current)
Heavy current - worst

Obviously, the fish didn't just swim away, but maybe they just relocated on the spot? Maybe moved deeper? We did experience that, one year, when the fish moved deeper on a current spot (we call the S curve, I know you know where that is) that we found the fish by counting down tandems and using bull dawgs. They were high on the spot/structure one day when it had changing current and moved off to the deeper channel the next day when it went calm. We figured they couldn't have moved far so we went out into the channel and there they were. Maybe the case is the same for heavy current but we just haven't tried it yet.

Are you experiencing this in areas that are not the classic current areas near channels?

Jeff