I get to 3A to clash with Sieg's 6A/3K/4K after +0 on hit which means that it is i15. To confirm that i did Sieg's BB on block (-15) and 3A punished ONLY up close, still making it i15 even though depending on the range.
Tested 3B vs Sie'gs 6K (i19) after a +0 and Sieg's 6K (considered i19) won. To confirm i did Sieg's 2A (-4 on hit) followed with a 6A/4K and 3B lost again, where Sieg's 6K would clash.
Nvm the above. If we agree on 3A+B speed then we can do a simpler test. According to your tests K on hit (+2) then 3A+B should clash with a 3B, but it actually loses to a 3A+B.
Now iGDR. Couldnt punish Cervy's 3A or Sieg's 1AA, both -16 on block, so i was probably wrong about that. Although i managed to get a clash with Sieg's b6 (i16), but it seems its because of the range/hitbox of b6 a bit further away.
Again a confirmation (on stuff other than iGDR) would be awesome.