Specific questions about solo male edging and orgasm denial.

I posted this on /r/sex without much luck and looked at a few old posts from there but it wasn’t quite the information I’m looking for and I have some questions about my own practice in comparison to yours to help figure out how to have even better orgasms:21(M), avid kegel exerciser, I’ve been practicing edging for some time now, getting more in to it over the last two years. I can stop and start more than a few times, I can make myself go for an hour give or take. What I’ll do is I’ll begin, come close to climax, stop, wait for my erection to go back down, and start over. Where I can run in to problems is stamina. Not with how long it takes to come, it’s after I’ve restarted 2 or 3 times I’ll start to lose my erection. Which is fine when you’re alone, I can still come bigly, but sometimes you can only hold the edge for so long and my stimulation starts to fade too. Like it’ll feel less and less pleasurable despite the fact I haven’t came, and every so often I’ll just lose the orgasm. All that edging and work for nothing :(. In my ideal world I can build up, stop, buildup, stop indefinitely until I decide to reach orgasm. Or at least do it for longer without potentially losing it. I have also practiced NEOs (Non-Ejaculatory Orgasms) where as one is about to come you hold it all in with a big kegel squeeze, go back down to a 5/10 arousal level, and continue. While these are similar I’ve noticed they don’t go as far.Another technique I actually found on my own is multiple ejaculatory orgasms. Sometimes I will jack off to orgasm and despite having just came, push through the tired and refractory period, and go right back to it for a SECOND orgasm that usually comes quicker. If I’m really looking for it I can push it to THREE, that one actually takes longer than the first two but it feels amazing. I did once do 4. Has anyone else had experience with this kind of technique? Anything like it? How to add on? (Regrettably I have yet to transfer this to sex with a partner, it requires a lot of specific and often very tight grips on the penis.)Another technique I have NOT tried is prostate stimulation, I’ve been meaning to buy myself a beginners toy.It’s a lengthy read but come on, gentlemen. This conversation is important. Get your own Orgasm Control toys: For men: http://www.amzn.to/1V6XQvv For women: http://ift.tt/1UWn54n