Deviating from GTO Charts

I am not capable of remembering all the possible combos of GTO charts.
When a chart says "CBet this situation 40% of the time" but "CBet this other situation 80% of the time" I'm lost I'll never remember.

I look at the situation and decide -- "OK -- this is marginal" or "This is Strong"

I then try to decide in play based on what I know about the opponents -- usually not very much.
Also, solvers base their solutions on the idea that other players also playing as close to optimal as possible.

So when sitting down at a new table, I play extra tight for a few orbits -- sometimes cutting my ranges in half and watch the other players very carefully until I get an idea of how they play,

Occasionally -- especially if I get a monster early on -- I'll loosen up at the beginning.

Cheers,
VS

appreciate your answer. Yes solver strategies are based on oppo playing the exact same strategy but they help you finding bluffs and finding fold and finding what combos that we might think are always a bet can actually part of the checking range so you can balance your range to be less predictable.
i just find that playing an avg of 16pfr is much easier than having a 21pfr avg in terms of constructing my plays postflop

maybe i only need to practice more and then ill be able to construct my postflop plays with more combinations

You should deviate exploitatively from GTO charts against different player types - otherwise it's you who are at best losing EV and at worst getting exploited yourself. GTO charts are a starting point against an unknown player type who we assume is GTO until we have more information. Ranges vary widely vs loose or tight players, maniacs or calling stations.

For example, you have correctly recognized that at lower levels, playing a linear 3-bet range including AQo, 99 etc plays better than a polarized 3-bet range with low suited aces and connectors against a population that overcalls and underfolds 3-bets and doesn't bluff 4-bet.