Help needed for choice in size

Hello, I started using the Helix Syn a while ago but didn’t get a lot of stimulation and started enjoying dildos instead.

Now I’m trying to get back to the aneros but I still get the impression its not providing a lot of stimulation, I almost don’t feel it inside me. Is this normal for a beginner? should I try getting one of the larger models like the progasms or the Vice?