I will take some measurements once the sails come out for the season, at the moment it's 19f outside

The world makes more sense knowing that Ron's thruster is actually 18hp and not 8. I figured his install was better, but couldn't imagine a few feet forward would make such a huge difference. So, you may want to take my suggestion for 15hp up a bit.
In terms of your instruments, I would highly recommend a navpod (or similar) at the helm. I have a set of instruments mounted at the top of the companionway like Ron, but I find when I'm sailing with others aboard they are always in the way, between me and the instruments. I have a chartplotter and radar (repeater) at the helm and I'm about to add a repeater that will get me any of the instruments displayed at the helm...it will cycle through wind speed/depth/boat speed and rudder position, along with many other NEMA sentences, at the touch of a button.
For your teak, you'll find as many opinions as there are people with teak. The best kept i've seen is on a friends Swan 53. This guy is EXTREMELY anal and takes amazing care of his stuff. He uses a two part teak cleaner, and a product called "semco" if I'm not mistaken. I see lots of decks, including my own, and none look nearly as good as his. They stay a rich golden brown color with just a very small amount of maintenance. If I remember correctly, he does a cleaning in the spring and two coats of semco, and then if necessary he does another coat during the season. I intend to try this approach this year. From everything else i've read the trick is not to use abrasive pads, etc to clean...just soft bristle brushes. Warmrain has posted some informative pics of what the teak ends up looking like if abrasives are used. He's also had direct experience for 20+ years on his HC, there is some good info in the 33 area of the board.
I have the Yanmar 4HJTE 100hp Turbo. It's a great engine, but I could use a bit more power in serious seas. It could be partially a function of my prop, Max prop, that may not be adjusted properly (prior owner installed/adjusted). Next haul out, I'm going to have a look. RPM's aren't right.
I'll be in Hawaii for vacation (Maui) in March. Which island are you on?