I wish I could reply with something useful, but sadly it's a lot more involved than those parameters of baffle and facing curve. Apart from, yes, higher baffle usually means brighter sound.
But AFAIK there is no one specific formula for ease of low notes. Yes, soft reed, long curve, small tip all can contribute, but if you gear anything towards ease of low notes, there is usually a trade off with difficulty of high notes. Unless this is combined with embouchure and breath development.
ie, no easy answers.