What airplane?
What kind of runway? Paved or grass? Tail dragger or trike?
I fly off a grass runway with 2-1/4 nose, 3" main trike gear.
I have a TT Pro .46 and it runs real well with an 11-7 prop.
If it is a trike gear and you upsize the nose wheel you should also upsize the main by the same amount.
If you go with a shorter prop make sure to use a higher pitch like 10-8 so you don't have your engine over rev.
Another option is a 3 blade prop. It can be shorter but still produce efficient thrust and load on your motor.
One more edit: no matter what changes you make it is a good idea to check your balance again.