Aneros feels too snug even with tons of lube

I’m a dozen or so sessions into the Aneros experience.

As of my latest session, I use water based lube to play around with my asshole, then finger it, then 2 fingers, until it feels stretched enough to be able to take the aneros.

I then use a syringe (non needle) to insert about 20ml of water based lube into my ass. And then slowly put the aneros in.

I’m using the Vice model btw.

After that, I wait the 10 minutes that people have reccomendded to get used to it. But even after that the aneros feels too snug inside, like it can barely move.

Would buying a dildo and then riding it for a while before using the aneros stretch my ass out enough to have the aneros not feel too snug?

Or is there something else I’m missing here? It shouldn’t feel snug and uncomfortable after so much lube inside and outside right?