Been doing a bit of research - which was due to me looking for a Hydrofoil for my Alpha drive.
A couple of guys on another forum advised using Smart Tabs .... anybody out there any experience of them ? .... they seem to have many benefits .. and at $100 ish are not that much more than a good hydrofoil, and much cheaper than hydraulic trim tabs ... and massively simpler to install.
The Trim Tabs sx seem ideal for salt Water boaters
http://www.nauticusinc.com/smart_tabsSX.htm