Hi Guys,
My spinaker/mast bending experience on RC27s and ARC22s is that as long as you keep the spin hounds at 1/3rd of the distance up between the main hounds and the top of the mast or less, NO PROBLEMS. I arrived at this location by trying the spin hounds at several heights above this position like 1/2, 2/3rds, 3/4ths, etc. AT higher positions the mast bent wildly out of control in strong winds. No problems, no bent masts, no broken masts, below the 1/3rd height point.
Bill