Newb with questions

Background: 30's hetero male with some previous anal experinece from buttplugs and anal beads.
Purchased a helix classic last week and have used it Saturday, Monday and Wednesday of this week. Each time has taught me a little more about me and the device. Using coconut oil as lube. I have started each session on my side with some deep breathing coupled with voluntary contractions. This has had really no result, no feelings of anything. I've tried switching to on my back with a pillow under my back, legs straight and bent and have gotten some little tinglings but nothing exciting. I discovered in session 1 that on all fours and kneeling can give me some really intense sensations. I say sensations because I don't know what category they fall in (p-waves, mini-os, something else, I need to reread the glossary). In session 2 I added a laundry basket to sort of drape my self over (hey, it was in the room). That ratcheted up the sensations significantly. I repeated that again in session 3 and it was an amazing feeling, started to feel like things happening on their own after a little nudge from me. Some questions from me.

1. I would like to be able to produce the feelings I get on my knees while on my side or back. Would a different model accomplish that? Maybe an MGX? Anyone else had success transitioning from all fours to something else?

2. I realize I'm very early in this process. All 3 sessions have ended with me masturbating to orgasm with the helix still in. I cant dedicate 3-4 hours to a session, life is too busy for that so I need things to "come to a close" in about 60-90 minutes. If I finish this way should I remove the helix first?

Thanks in advance.