Hello there, hope u are fine. I write this to understand this deeply. I think I find THE LEAK in my game.

I play like 30 sngs a day, $1, 180/45 regular speed. I'm generaly fine but winning not much. My ROI on this is 12% this year. 90% of the sesions I win/lose like $5, the other 10% win/lose like $20/30. This generaly comes in several days togheter winning/losing nothing, or winning a lot for several or losing a lot for severals.

Thinking about this, besides variance I think my problem is being a "natural" nit tryng to play LAG. The problem comes in 2 ways:

1- low 3bet in general. I know I should have like around 10% 3bet, but I have around 5%. I try to have this in mind but end up always playing the old way because of fear, especialy on bubble
2- Bubble play. I have times where I tend to play it like a FT. I miss lots of pushes or 3b pushes with 15/20bb

So.. can you answer this please? I need support on the idea to believe/understand it for real deep inside me

Is ok to think that, if you play a correct BR management, is better to lose a 20bb spot with a "dangerous" flipping 3bet push or a 13bb push spot with JTo from CO than bleed out to wait to find better spots?

I am not SUCH a nit, but for example there are times where I give up spots like A7o from CO with 14bb or 44, or don't 3b shove with A3s to a 45% steal guy from BB/SB Because I feel is so much variance.

Maybe this is not clear at all, what I mean is: Thinking chip push/fold spots in terms of "I have 40% chances of winning this spot with this hand and is enough for my stack and position" Is the correct way?

Is it better to push 16bb with 40% chances than wait and push 9bb with 51%?

If that 12% is over a significant sample then you'r already doing a lot right even if you are only playing micro stakes.
It's hard to clarify what mistakes your making on the basis of your post. A 15bb - 20bb stack isn't normally going to be an open shove in a sng. Your still in steal/raise for value territory with this stack your probably not missing many spots by not shoving.
You should never allow yourself to be blinded out even if you have to shove absolute rags with a short stack. What is a 'better spot' exactly on the bubble of a sng? You can't pass up on a +ev spot on the basis that a more +ev spot will present itself. You either have the hand to shove or you don't.

You probably should adopt an attitude of "I really don't want to min-cash". You already have a +ROI, which is good, but trying to avoid busting on the bubble is a case of "good being the enemy of great".

With a reshove stack size 22-15 BB, I don't like going with a weak A. I'd rather go with a KJ, QT kind of hand which gives you 2 overs vs raisers who'll call with middle pars, and better equity vs more Axs hands than your weak aces.

Around 2500 is this years sample. I don't push with 15/20bb but I do 3bet push to medium stack villains. I tend to do it with 15 or less, or with 15/18 when there is a new blind level in a minute. Maybe I should OR more and be more agressive post flop when I don't hit.

That's right, I think my problem is leting myself blinded out. Here are some examples for what I mean by that.

- I am in UTG with 15bb, next blind level is in 6 minutes. I get dealt A5s/44/KTs wich are a push acording to charts. On these moments I feel like I prefer to wait for next hand in BB or just push any two in SB than Shot A5s to the whole table. I understand there is FE and is good with 15bb but where I play I get calls all the time with better Ax and end up pushing with a Nude 5, 9, T. Isn't realy and in general better to 3b push next hand to BTN/CO or to BB in SB with any two? (then I get hands like Q7s/78s/22 and I don't push them, wich is other problem, I'm a scared rat)

- I am in CO with 12bb, next blind level is in 14 min. I get dealt A2o. Villain in SB is 15bb reg LAG. Villain in BB is 58bb maniac who will call wide. The thing I take in mind in this spot (and must be the problem) is that in 14 minutes I would surely get a better spot. Also maniac will call with any Ax and PP. Lag guy in SB knows the maniac and me and can overpush and get great odds with like any decent hand.

There are moments where I don't care and do it anyway. I lose some games earlyer but in general I think I win more money. Then, I get close to geting my bankroll to the next level (need 600 for $3 sngs) and start being a coward and play bubbles like FTs.

I Hate going with those hands too. There are villains that OR +35% from BTN or SB and we should be doing it but is so horrible.