trim tabs

Curious what size of tabs people are using. Bought a boat last summer that came with what seem like very large tabs. It's a 21' Hourston cuddy with and original pod. 2003 HPDI 175hp Yamaha 2 stroke on her. Tabs are ~9 x 24" (Bennett hydraulic) - some photos below. The effect of subtle trim...

I'm planning to install the Bennett Trim Tabs on my Campion 542. I've been looking at the M80 kit like the one on this link: https://bennetttrimtabs.com/m80m120-sport-tab-system/ Anyone has any experience with this particular model or can think of a better product in the same range that fits...