I have run various biats with these fitted as with real life People want to sit at the back where you do not want all the weight! They work very well at getting the nose down and planning at lower speeds
BUT I think you need PTT to get the best out of them.
I have a SR4 with a Yam 50 hp with PTT and have used this for towing water skis and toys for me I blocked off the hull as in the harbour at 6 to 8 knots is is a right pain dropping on and off the plain, + 5 plus of us in it and it ends up very stern heavy with the foils fitted I can get the nose down,. If it is me blasting about the Solent I have taken them off and it runs with out any problems with the holes in the cav.plate.
I do not like fitting them but they do a very good job if they are needed, my Ribeye 6m dose not have them and I have never needed them.
Have a 6.5m hard boat with a inboard with I fitted them to as again could not get the nose down with out them and all the passengers wanting to sit at the back.