Unfortunately they are not interchangeable. In the generational changes we modified more than just the foil section.

Squirrely down wind and having cavitations or your rudders stall are 2 different things. 1 of the design compromises on the F16 is transom length behind the rear beam. There needs to be some minimum foot length on the main sail, so unless you are willing to place a stiff beam for the boom section, most sheet systems opt to directly attach to the clew of the main. There is also a desire to keep the maximum tramp size to allow for easy handling of 2 crew. The tiller length then on the Blade is then pretty short. The same arm travel in your steering can result in almost twice the angel change in the rudders relative to some of the 18 and 20 foot boats. Of course a lighter weight powered up platform will be significantly more sensitive to the conditions than the heavy weight, or even the longer light HTs.