Learning to do good contractions

I recently got the Helix Trident Syn. I’m trying to do the contractions by putting it in and squeezing rhythmically, but it isn’t that stimulating and I’m not noticing the twitching response people describe. I like having it in and can get some good pleasure from grinding my ass against the bed with the toy inside, but since the Super O is a muscle thing I feel like maybe my muscles are just weak and I am cheating by grinding. I definitely notice that I am having stronger penile orgasms when I have been squirming around with the Aneros for a while, and today I found myself craving the perineum stimulation while touching my cock so I put it in and had a good wet orgasm. It’s nothing like what people describe with the dry orgasm from contractions though. Anyone have advice on how to have good contractions?