However too (lol), in doing this and that and testing this and that, I feel like I have a better method for identifying "more than likely" ranges and the whole work distribution, than I had in the past.
P.S. If my bot says I found the key, reach out to me...LOL
P.S.S Still a lot of openings in the Beat Bram donations/crowdsourcing

Oh, man. I really hope you're not influenced by getting a few unlikely strikes sooner than expected, like your 58-bit hit last night.
Hitting the end-tail of the distribution does not mean it stays there long-term. By long-term, I don't mean scanning another 0.01%, but rather maybe long-term to the point of having chances to hit something like a 67-bit prefix.
I already gave a counter-example: I applied the prefix theory / gaps / however you want to name it over 9000 trillion keys, and the results were worse then by simply scanning sequential.
In other words: I never stumbled on a 53-bit key. More smaller-prefix lengths? Yes, indeed. But how in the world would that ever be useful for anything, except as a base for "please scan more"? Where was the "we can avoid scanning a vast amount of the search space" in my experiment? Well, probably in the skipped regions, but going over those as a backup simply means I was better off scanning in sequence, or am I missing some wisdom?
I think you have my style confused with Bibli's style.
I don't waste anytime/hashes nor skip to the "next" range and sit there until I find another one lol. The partial matches you have seen coming in...I do nothing with them. Just collect them. I've already entered all the ones I will enter for 69. We over here gap filling now lol.
To keep it simple, for now. I only collect x amount of partial h160 matches. Then I create my db and start filling in the gaps. The number is still fluid as I am trying to tweak it based on available resources (CPUs/GPUs). But for 68, I did not have the actual key buried and was right at 2^32 keys away from solving. It all comes down to firepower. If I would have had about 1,000 CPU cores and 15-20 more GPUs running for 68, I may have found it before Bram. I was walking that range in. Obviously, more fire power, the quicker it would have been.