Bracket/motor height

[TJS]

Hi guys. Just completed a closed transom with a 25" Hermco bracket. I mounted the bracket per Hermco 21" up from the bottom. I can only get 4" from the bottom to the cav plate at the highest setting. Just wondering if I did something wrong where some other guys can get it higher on a lower hole setting. Did they put the bracket higher. Also would the location of my trim tabs effect anything. I got 41 out of it with a 225 carb Yamaha 5200-5400 wot left hand rotation. Prop is a 17ML. I am considering looking at a stern lifting prob. I have attached a few photos. Any input would be great. Thank you