Oh gosh Justin, you kill me lol.Definitely HCM. Nice one though!
I have grown quite a few vietnamense. They are pretty difficult, although the most recent batch of two I have from Taiwan does pretty well.
I believe a lot of plants with the vietnamense label are either Ho Chi Min or, Ho Chi Min x vietnamense.
So I have three criteria to know if a plant of vietnamense is the straight species:
1) it dies after blooming
2) the flower either always blasts or never opens fully
3) the staminode does not have red color in it
Here are my current two clones: