If you don't like your tone for any reason, you better just play out as if everything was normal. If some note disturb you, don't hide! Use a normal air flow or more air if it's appropriate. That way, it won't get worst at least and it'll get better eventually with a bit of patience.
If you are sight reading or don't know the piece very well, using less air will not help you. On the contrary, it'll only make you miss more notes and make more mistakes which will further affect your self confidence. Even if you aren't sure, you are probably playing the right thing! So play with confidence. If indeed, you're playing wrong notes, you'll fall back on your feet faster with more air.
So don't let a few bumps on the road affect your playing. Play out no matter what and you'll always sound strong and confident.