Some tough love due here.

It really sounds to me like you want to be handed a simple set of rules that will make you a ton of money. Those days are long gone if you want to beat 50nl+. You therefore need to decide if you're happy to beat 25nl for a decent clip, or try and ladder up by having a much better approach to study. Your first point should be to post some hands on this forum and outline your thought process.

You alsoneed to be aware of how shocking variance can be in today's games, where edges are thin and most players struggle to beat the rake. Losing 6BI EV in 3k hands is not even coming close to being outside a normal range for a small winner.

KK hand: you need to be plugging this into Equilab. once you do, you'll realise this is likely a marginal spot not worth tilting about.