Find a big bit of free wall space in garage. Spray paint in large letters. I will always think about jetting by throttle position, not revs.
Ok, maybe brush paint that. But BIG.
Test bike. Consult wall.
Make adjustments and test. Consult wall.
I'm tempted to try tell you something about mainjet size, but I'll bite my tongue as the alchohol may make what I'm about to say completely wrong.
(Ha. Reread that and wouldn't be the first time alcohol has had that effect! )
Try find a long paddock ideally with uphill. Try a size bigger main. Full throttle only. Is it better or worse? If it's worse, go the other way.
Consult wall.
Once revving out nicely at full throttle, you can try pay attention to mid positions. Be consistent.
After each test, consult wall.
If you buy a roadbike with FI or CV carbs, ignore wall. But until then. . .