6 month journey. Advice, suggestions welcome.

So I've had the Helix for about 6 months now, and have been using it very frequently(3-4 times a week when I can) over the last two months. The first 4 months I didn't really experience anything pleasurable, and I didn't have even involuntaries.
About 3 months ago, I started getting into a more relaxed mindset while using it, and started having very slow involuntary contractions at the start of a session. I also decided to start with nipple play, and a couple of days of that plus aneros sessions, and I my nipples got significantly more sensitive. Playing with my nipples now gives me jolts of pleasure in the prostate, and sometimes handsfree contractions with or without the aneros. I start with very slow, light touch, but faster or more vigorous stimulation effectively stops any prostate sensation. Even the slow, light touch does the same thing if it goes on beyond 2-3 minutes.
With the Helix in, the sensations are probably the most pleasurable thing I've experienced so far, but also stop with faster stimulation or stimulation longer than 5 minutes. Nipple play with the Helix in also doesn't really translate into involuntaries for me, and seems to distract my mental focus from the prostate, which I feel might not be helpful at the beginning.

Involuntaries have become more frequent, and now happen numerous times throughout a session, but are still fairly slow(I'll only have 1-2 "faster" ones a session), but there is some erection cycling and smallish amounts of precum. I've also started experimenting with abstaining from ejaculation and penile stimulation. Waiting to see how that goes. An interesting thing happened today when I was giving myself an enema before my session. Literally 10 seconds after inserting the enema, significant amounts of fluid(4-5 large drops) started leaking out of my penis, similar to the couple of times I've milked my prostate. I initially thought it was precum, but it was a little more milky. Any ideas as to how or why that happened?

I'd also like to figure out if there's anything I can do to ease more into the involuntary contractions, and wonder if my slower progress is because my sessions last at most 90 minutes(I spend about 15-30 minutes "doing nothing" except focusing on prostate sensations)