Poker-AI.org

does anyone have any insight or code into the exact current methodologies for creating flop/turn/river buckets?

I'm not up to date with this stuff, but I'd say read Noam Brown's papers and if it's not clear follow up his references.

would recommend the paper "Evaluating State-Space Abstractions in
Extensive-Form Games"

distribution aware for flop&turn and ochs for river (or just win and draw% if doing a very coarse abstraction)

potential aware is a little better than distribution aware, but harder to implement

clustering algorithm is just kmeans

It seems to me that it's impossible to pick one strategy for poker that will work all the time, because every time the game and the players are different. A few months ago I was playing poker, but soon I got tired of losing because I couldn't win with one strategy.

That's the point of Nash Equilibrium solutions. They wont lose against any strategy (provided you play for long enough)