Did you increase the main jet or DECREASE the air correctors?

The Air corrector has much more influence on mixture strength at the top. If it is smaller, the less air in the mixture.

The main jets affects all RPM (above idle), but at top end, its the air correctors.

What Weber? A 34 DMTR by chance?

You should be around 145 on the mains and 195/160 on the airs with F30 emulsion tubes for that carb.