IMHO...
The first and often best solution (posted above) "optimize the tilt setting and weight distribution in the boat."
If that doesn't work, rather than slowing your boat down with a foil, spend a few bucks more and get Smart Tabs.
I had "getting up on plane" issues on a boat years ago. Local boat guy suggested a hydrofoil.
It helped and worked well, but I lost speed. Boat felt "squirrly" when she got up to top speed. There is a reason for this, which, at the time, I did not understand.
Did some research and took the foil off, and put Smart Tabs on. ALL of my issues were cured and I wouldn't take them off for any money.....unless....I replaced them with adjustable Lencos or Bennetts. But .....the adjustable tabs cost a lot more, and for my purposes....the Smart Tabs do the job.
Do a Google search for Smart Tabs. Company that makes them is Nautilis ??? They have a GREAT video on their web site that does a nice comparison of foils vs tabs.
I've put Smart Tabs on three boats and have never been sorry.
regards, rich