That boom looks maxed out . The sail needs six inches more downhaul . Then six inches more outhaul .
" Captain she cant take anymore , she's breaking up ".
Looks like the extension has undiscovered adjustment


Last but not least , the bottom batten needs a tug .
All is not lost , If the boom has more in it , it could work.
ps , my two main advices at this stage is , 1 , replace the rubber joint that connects to the board and 2 , only onshore winds .
Its awesome and worth it

pps , for learning you need a whopper of a board . The blue board in your pics is way too small for now .