Dash Paint Gloss or Flat Clear

I've got my dash blasted and epoxy primed and am ready for basecoat tomorrow. I was thinking that I would flatten the clear for the dash to help reduce glare. I've never used flattener before so I read up a little on it. I'll call my paint guy at SPI for help on mixing ratio.

I'm just asking your opinions on painting the dash a semi-glass or matte finish.

Good idea? Bad idea?

Just seems to me that a really shiny dash would blind me since I'm driving in a convertible as well.

Thanks for any input for I shoot the base and clear