Regular masturbation with the Aneros can delay my progress?

Looking for advice on the title specially, but let me tell you everything.

I’ve been using the Helix Syn for about 5 months so far, and it feels pretty good. It takes me a while for it to be really good, but it does eventually, and my sessions tend to last about 2 to 3 hours. Nothing out of the world or a lack of control over my body, just a general good feeling. At the end of the session, however, things tend to die down and inevitably I end it with regular masturbation. Not much of it, about 5 to 10 strokes is enough to get me cumming, but I need to finish myself off by hand anyway. This has been the “routine” for about the past month.

So. Would it be better to just not cum until I can do it hands-free? I’m trying to do it, but often it’s too easy to just stroke myself out. Would it be better to remove the Syn before I can do that? Am I screwing myself out of a hands-free orgasm by doing this?