Dry hopping is fine to do in 1/2 oz increments too. If you love the hops then 1 oz won't hurt, but my last dry-hopped beer I used 1/2 oz Simcoe and it was great. If its not enough for you, then you can bump it up next time. If 1/2 is enough then you saved 1/2 oz for another brew.
“In Vino Veritas, In Cervesio Felicitas” — Anonymous