Revision of the above:
2D is the best ground poke now, use it.
Avoid using 623C at all, 623B is the only usable DP besides 623D.
Never use j.A unless they're blocking, j.C and j.2C is the best Jin has in air now.
236C is best option for okizeme, neither 2A nor 5B are reliable enough.
Only use a DP when you know it will definitely hit or have 50% meter to RC from.
You're a fool if you perform an air dash while they are not frozen or far away.
Best knockdown for Jin = 5b(2 hit)>2b>5c>3c, possible to do a 2c after the 5c for more damage, however this is not meant to do damage as it is used to put pressure and force them into a corner.
Use regular ice swords, they've been upgraded so they're better than they were before so use them, especially j.236C from far away and j.236A/B especially on a blocked j.B.
Depending on height, be ready to 623B or 2D if they decide to come for you, 2D is the most viable option because you can go into a 5C from it.