Nice looking builds!
You really made a lot of progress between your first and second build. I’m looking forward to seeing your third build.
As far as your riding position. The center of mass of the combined board and battery and components should be as close to centered over the front wing. However this weight being a bit too far back does not have enough of of an impact to cause the “on the nose” riding position.
What type of foil are you using? Most foil manufacturers don’t like to talk about “trimming” anymore. But, believe it or not…most wings, and most setups would benefit from being trimmed.
Some designs are really easy to trim the rear wing and some are next to impossible.
On my slingshot wings it’s easy to trim. The rear wing on most foils is set at about 3° pitch down. This helps overcome the drag of the mast and wings through the water and forces the front wing to pitch up and want to rise out of the water. This pitch down of the rear wing, to some extent is needed but it creates a loss of performance due to its lift being down instead of up, requiring more overall lift, and in turn more drag.
I use a small washer under the front bolt of the rear wing, and play with the pitch. Somewhere between 3° pitch down and 1° pitch down usually works best.