Lawrence,
I do check oil levels several times over the weeknd, just to make sure I never see anything but solid oil in the site glass...at elevated revs. In fact I even added ANOTHER 1/2 qt to the sump to see if it would help the dips...but it didn't. Bearings were fresh at the beginning of the season, but maybe after 4 races they're getting loose. Probably time for a refresh.