Scope height won't make that much difference. And what you gain at one end you'll lose at the other.
But that and lighter flatter pellets will help.
Changing zero changes nothing. In fact you can't change the top of your trajectory unless you change your pellets or scope night. It will always be in the same place as its a result of that.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep