I don't know if I have much in the way of Doom tips. I would say go for more optimized confirms instead of just j.M into footdive, but online especially it's better safe than sorry. One I do a lot is a happy medium in terms of difficulty vs. damage is j.M, j.M, adf, j.M, j.M, land, st.M, launch. It scales more than doing a more optimized fwd.H footdive confirm, but it's super reliable at normal jump height and leads to a more damaging follow-up combo as opposed to j.M > S footdive. It's also nice that it works in happy b-day situations too. For post air throw follow-ups, try doing addf after the throw animation, land, and then depending on the height you performed the air throw at, you may be able to get in range with a single tri-dash, otherwise you should ground dash cancelled into tri-dash if you're too far away for the single tri-dash to bridge the gap.