little update on progress:
I took this process further and tried to be two of my natures at the same time. Self and no-Self that are kinda exclusive... so when I made myself to experience through them at the same time... closest thing in description I found is
Nirbīja Samadhi, experience combined with self image of it and they somehow zero itself. Well, not zero, more like happy, full of Kundalini void from where all comes and to which all goes

It is self sustaining and don't need any object of concentration, everything is it's manifestation and I can do like whatever as long as I don't try to separate myself from myself. And even then I know this direct method to attain this Samadhi again so it's not really the problem.
This method feels like this method from The Sutra of Perfect Enlightenment:
[quote="Buddha"]Good sons, some bodhisattvas awaken pure Perfect Enlightenment, and using the pure enlightened mind, do not attach to illusory transformation or the marks of quiescence, and fully realize body and mind both to be obstructions. Without awareness of the illumination of enlightenment (of śamatha) and without depending on all sorts of obstructions (the illusions analyzed in samapatti), they eternally transcend realms of obstruction and non-obstruction, receiving and using the world as well as body and mind, whose marks abide in the objective realm. It is comparable to the ringing sound in a bell which penetrates to the outside. Affliction and nirvana not hindering each other, they are directly enabled to produce the pliancy of cessation-extinction from within. Accordance with marvelous enlightenment and the realm of cessation and extinction is something that self and other, body and mind are unable to reach. Sentient beings and life are all just floating concepts. This expedient method is called
dhyāna.
I am not really sure if this Sutra talks about what I did but I thought about method after reading this Sutra and I immediately knew that dhyāna is my way to do it and that it can only land instant enlightenment. No gradual 'extinction', that would be silly really. Anyway, other methods from this Sutra weren't as appealing, they didn't sparkle with me

I could try to describe it more but would definitely not do it justice so I will restrain myself from doing that. Let's say that problems of:
- pain of self
- gloominess of no-self (Dark Night as I see it)
- feeling of incompleteness
are all gone. Pain of self not gone because self is gone but because pain is gone. Gloominess is gone because I don't feel incompleteness anymore.
Like one famous person said: 'my vipassana problem is gone' and I would like to thank that person because it is a life saver. Keep the good work going, can't wait for MCTB2

I attained nothing, just returned to how I should always be feeling and that is that. Title 'Enlightened' or 'Arhat' feels way to pretentious ... I guess this make me just ordinary folk with self that looks on people struggling to attain enlightenment and says:
'Get down from that tree because we humans should live on the ground. There is nothing on the top except maybe excellent way to fall down to the ground again'