I, too, cannot get the lower main windward telltales to flow properly. When I turn to the point where they are flowing, it seems like I have lost power and I am going slower than before. Question: Could this be caused by the mast over rotating and disturbing the airflow on the luff?? I have the older Seaway 5:1 blocks and when sheeted tight they seem to "push" the mast past the stopper on the mast base and cup.