I tried a few panels with no peelply down and I experienced resin following the fiberglass more than I liked. The triax is 0 strand away from the core; or down. And I got a lot of deep grooves and shine.
Peelply resulted in a more uniform surface.
Because I was unhappy with quality and tired of all the rebate and relief prep; I also modified the outside to always be up. So the mould surface became the inside of the part.
Definitely could be done the way you suggest. Especially if you can get a shiny surface without grooving or air.
If I had to guess; one of my issues is running the pressure up too high, but everytime I back it off, I get air pockets on the mould side.