Hi Ken you are correct about trimming the A Class continually as they are a total different animal to the F16. Glen Ashby is quoted as saying that on average he adjusts his downhall 10 times up a beat. However, Glen probably sails for over 300 days in a year whilst I would be lucky to sail 40 days in a year. Therefore I find it best just to set the controls to a happy medium and just sail to my capabilities without the worry of too much, too little of this or that control.