"How have Bovada players here adjusted your Pre and Post Flop GTO ranges due to the anonymous untraceable nature of the site?" GTO ranges should not differ in any case, because their are theoretically unexploitable, so they will be profitable even iwthout stats tracking, no matter if you play against the worst or best players in the world.

Furthermore, better start of with specific spots that give you headaches, for example which hands you should c-bet on semidry A or K high flops and work your way up there.

Bov card catcher can help
I just try to play a strong overall game and make exploitative plays based on my experience at these steaks
Since u can only 4 table u should be able to get a good idea for how players are playing and adjust your strat from there

There is a good video on this site about proactive vs reactive play. It's on bovada and he goes into detail about population, and times when the population or certain villains are going to be folding or c betting an exploitable amount of the time.

Not sure why you'd want to be balance on anything lower then 3/6 though.

Perfect GTO strategy is always the same, as long as the rules/blinds/antes are the same. Doesn't matter who your playing againts.