Issue with brand new TE2+ controller

I just bought a brand new MadCatz TE2+ fightstick two weeks ago.

I play F.A.N.G and my Senpukuga / coward crouch (P+P+P) is only working about half the time (I just tried it 20 times in a row and it only came out 11 times; the other nine times I got either cr. LP, cr. MP, or cr. HP).

But F.A.N.G's V-Reversal (back+PPP) is working flawlessly (just did it 30/30 times in training... no failures).

I did not have this issue at all for the past five months with my PS3 TE stick connected as a legacy controller.

I even tried switching all the button inputs over one to the right (so triangle became LP instead of square, etc.)... and the issue remained.

Everything is pointing to operator error here, I admit. But if I plug my PS3 TE stick in, the problem goes away completely. And it's a little odd that I have no issue at all with the V-REVERSAL on the TE2+ despite it being basically the same exact input as the coward crouch.

I'm stumped. And it's frustrating because I've gotten punished online many times for throwing a cr. HP when I meant to do a Senpukuga.

I'm just wondering if anyone else is having this sort of issue with a TE2+ stick, or if anyone has any advice for me?