I run 40tt behind my offshore boards. Look at how the new board have dropped the screw eye where the tattle flag goes in if you do this to yours it will help the boards pull harder as ND not lag behind especially on turn's a few years ago I first did this but wasn't using the tattle flags, I has the screw eye in the thin rear side down low. But I had a hard time reading all the shorts, the new location with the new flags will allow you to run 40tt with the flags still working. I have to adjust the sprung tension tighter in waves to keep the flag from dropping everyone the board rolls over the waves. But the extra pressure means short or whit perch become tougher to read. I like to try to keep at least 30 ft between my boards.