Progasm Jr hitting just beyond the spot

Since I wasn't a complete newbie (some experience with anal toys), I decided to go for the Progasm Jr. As my first Aneros purchase.

It was definitely something different and interesting. No problems with the size, although the tabs (both of them) can get to be uncomfortable (painful) after intense spasms. Haven't achieved a Super-O yet.

However, my main question is this. I've felt that the tipo of the Progasm Jr. is hitting right past my prostate. If I pull it out a bit, keep it there with my hand, and contract, I'll feel it hitting right in the prostate. So, is this as it's supposed to be, or is it reaching too far? If this is the case, what model should I consider? I've seen that the Helix has the same insertable length, so I don't know what to think. Thanks for your suggestions!