Akuma & Dan HC's

Can someone explain to me how do Akumas Shun Goku Satsu (Tian), & Dan’s Otoko-Michi.

I know they both use 3 levels I can’t get either move to even start up.

SGS is LP, LP, Forward, LK, FP. It has to be done quickly.
Otoko Michi is FP, LK, Back, LP, LP. Same speed.

Those moves are easiest to do on a stick, where one can quickly type out the commands. On a pad however, it is hard as hell.

Maintain the same speed for all the inputs.

Depending on the speed setting, you may be either putting in the commands too fast or too slow.
Too slow is the more common case.