Not too sure if this has already been posted, and I'm honestly a bit too lazy to check so blah:
6B > 5C > 6C(DC) > 6D > jc > jC > BE > 5D > DS > 5D(DC) > 3C > 22C > 5A > 5B > 5C > C.ID > 3C > 22C. 52 Heat 4555 Damage
6B starter only works on Hazama and Lambda from what I've tested. It also of course works on Tager, but because you need to do D.ID on him, he'll tech before you can get the dash under 3C. Other starters (excluding 2A and 2B) when the opponent is crouching should allow you to connect the second 5D > 3C on all dash 5A characters.
The best I've been able to get out of the extra 5D (meterless) is:
6D > JD > 5B > 5C > 6C(DC) > 6D > jc > JC >BE > 5C > 5D > DS > 5D(DC) > 3C > 22C > 5A > 5B > 5C > D.ID(1) > 3C > 22C. 60 Heat 6003 Damage
This works on all dash 5A characters, but against Hakumen and Tager, I recommend omitting the 5B after 6D > JD, because you can 5C > 6C them without having to dash and it makes the timing of this combo against them a bit easier. It'll do 6099 Damage, but net you only 57 Heat. Another thing to note about this combo against Tager, is that you have to slightly delay the straight punch from D.ID(1) to be able to catch him with dash under 3C.