IMHO with some rockets (even after simming and ground testing), one still has to learn the idiosyncrasies of how to fly them. Apart from any potential fragility issues (not to cast aspersions on your clearly excellent building skills of course), I'm thinking this might be a rocket that has a high 'chute gore tangle factor' (unfortunately I can't remember the algebraic expression for that right now, but you get the picture). So a flawless deployment might be something you have to perfect over several flights, trying different sizes of drogue etc. Therefore I'd say if you do use it for your L2 cert flight, get to know it first by flying it on some big L1 motors. Just my £0.02.