I am trying to save your money here.
You don't see your whole method is falling apart. You are going to lose everything if you lose 31 times in a row and you are saying it is pretty common to see no neighboors for 35 times in a row!!!! Think please before to talk.
You believe you are safer because you waited for 18 misses in a row. So, yes, based on your experience, you have about 100 times less chance to lose. But your winning are going 100 times slower also, so at the end, the balance between your win and your lose will be exactly the same. So, if you believe you are going to lose everything by playing at every spins, I can guarantee you 100% you will lose also everything by waiting for 18 misses in a row.
Easy example, I saw once no black during 53 spins on live roulette. So, if I take your theory, I just need to wait for let say 45 black misses in a row and be able to play progressive bet for 8 times in a row and be sure to win as we never seen more than 53 misses in a row with millions of spin. 0% chance to lose, correct? True, I can watch millions of spin without losing.... but big problem, unfortunately, no win neither. The truth, I saw only once 45 times without black in a row (the same time I saw 53 times without black of course) so if I waited for 45 losses in a row, I would have lost my 8 next bet. So, based on my experience, in one time out of one, we would have lost everything even if the chances to get 53 losses in a row were really close to 0.
Now, luckily for me, I was betting on the hot colour as always and I won almost 50 times in a row (if we remove the two times the 0 came out).
I want to hear the truth from you. Your target is to win only 20% of your bankroll which is really not a proof at all of a winning method. To call your method a winning method, you need as a minimum to be able to multiply your bankroll by 5 before losing and being able to repeat a lot of times. So, were you able to win 25 times 20% of your bankroll to make it once 5 times??? To be honest with you, even if you said yes, I don't believe you.