You need to set the timing back to normal! A cars timing is supose to be spot on, not half an inch forword because you think it gains power. It dose not! If you inproperly set the timing it could cause serious engine damage!
wow if you have a car that requires 87 octane fuel and you fill it with 93 octane it would benifet the engine to increse the timing as 93 burns slower and has a better detonation resistance and runing the timing more advanced also makes more power because of where the piston is at in the stroke
with premium fuel it will make more HP with that timing advanced which would be pushing it toward the firewall if you retard the timing it will make more tq which is what youwere doning before thats why it felt better down low