I do understand the "clustering" phenomena but what I do not understand is the grouping association, do your groups contain all available numbers?
Like I've said before, I see no reason why when in my group of "A - B - C - D", that's 4 elements, there are 2 over-performing and 2 under-performing I have to consider it as an overall success when I'm carrying over the unnecessary burden of 2 elements.
In other words, when with 1 foot standing on ice and with the other on fire I cannot claim that my body has an average temperature...
Furthermore, you are restricting the possible combination of active (over-performing) numbers, you should discard none because any number and every possible combination of them are potential winners.
That's the most common mistake, approaching game with a predefined idea about what is going to occur, nobody knows better than the game itself.
So let it guide you, consider it as the transmitter and your brain as the receiver, remove any filters (predefined concepts) you might have and be like "tabula rasa" (blank paper).
Every session, every game is unique, thus let it write its own history and if you are good on interpretation of the presentments then there would be always a light at the end of the tunnel.
Consider the following, every number is a repeat because all of them have been shown up at one point or another, therefore why to call some when all of them are repeaters?
Law Of the Thirds doesn't favor repeaters or sleepers, neither average numbers, probability remains the same for all regardless of appearances within last 37 spins (cycle), what does this fact is telling you?
Most recent numbers sometimes are profitable while other times are not, sleepers sometimes are profitable and some other times are not.
My conclusion is that you should adapt another selection criteria rather than how many times did or din't come this and that.
I do not believe in "hit n run", nor to progressions, money managements...etc
I understand that you may not like what I'm saying but that's just my opinion, you could ignore it if you wish so.
Thank you for providing me the opportunity to express what I perceive as the most proper roulette betting approach.