The vang is a key control in any squaretop mainsail and yours looks way too tight in that picture.
To much vang and you will create a massive shit fight for control between the main and the rudder. Your leeches should be somewhat balanced. Jib and kite are in harmony, main leech is not...
In the pics, I see a short version (grey boat) and a longer version (white boat) - Any thoughts on the speed difference between the longer version vs the shorty?
I was thinking of sugar scooping my boat, but canned the idea as too much money for too little gain.