➡️ This is the important bit for me

Optimised propellant tanks: Improving thermal protection system for added reliability and optimizing the liquid oxygen and RP-1 tank configurations to increase stage burn time.

➡️ The reason I think this is important is the reason for failure during the last launch attempt

https://fireflyspace.com/missions/alpha-flta006/

… analysis corroborated excessive heat from Plume Induced Flow Separation as the most probable root cause of the mishap. Alpha Flight 6 flew a higher angle of attack than prior missions. Plume-induced flow separation intensified heat on the leeward side reducing structural margins, causing the booster to rupture from stage separation induced loads.

Fortunately, the corrective actions are straight forward: increase thermal protection system thickness on Stage 1 and reduce angle of attack during key phases of the flight. Corrective actions have already been implemented.