Am I doing it right?

I’ve purchased a couple of different Aneros toys (helix syn and helix trident) which I’ve used several times with the same results each time. I’ve done it hands free every time, doing the pulsating/hold to breath counts, and I do ejaculate every time but I’m usually spent after it. Am I stopping short of the elusive “super O” or is this it? From what I’ve read from every one else, the prostate orgasm is dry so I’m thinking I’m in the right direction but not quite there yet.

I do notice the slight twitches when I’m either clenching or releasing the toy, which I’m still working on keeping that rhythm.