An AC/heating register on our kitchen ceiling blows air directly toward a gas cooktop causing the flames to flicker. Adjusting the register doesn't seem to make a difference. I've looked into air deflectors but the ones I've found seem cheap or have bad reviews.
Is there a high quality air deflector out there or, even better, an alternative solution (e.g., a highly adjustable register)?
Here's a photo of a similar register.

