Lifting a hull to windward is exactly the same with or without T foils. The only times that T foils produce ANY lift either up or down is when the hull pitches forward or back, therefore due to the forward motion of the hull, the lift generated by the foils is mostly directionally forward, and not simply up or down therefore there is virtually no extra loads on the transom, if the hull is level with the water surface then the foils are lift neutral and lifting the rudder and the hull offers only minute (not even noticeable) upward resistance
We have found that the great amount of pitch dampening by the foils lets the sails work almost to their optimum all the time instead of darting forward and then back at which time almost stalling in light choppy conditions half of the time. Since we put T foils on the Alpha F14 the increase in overall performance in all conditions (and particularly in the light) has been “exhilarating”. We sailed a point to point race in the Southern ocean last weekend in very light conditions against 20 odd cats all of which were larger than the F14 (F18’s, F16’s, 5.8 NACRA’s etc) and for a large part during the middle of the race two Alpha F14’s were leading all of them (actual). At the finish the first cat across the line was a Hobie tiger followed closely by an Alpha F14. On yardstick Alpha F14’s took 1st and 2nd by some minutes. Before the fitting of the foils that just would not have happened. Since fitting the T foils to two cats neither has ever “pitch poled” regardless of the conditions. Before fitting both had regularly pitch poled in heavy downwind legs under spinnaker.