Your mold is way too polished. The lack of smoothness in the plastic is in all probability caused by the plastic "shutting off" in local areas leaving a series of non connected bubbles. This makes the part come out non-flat. this is a common error made by machinists making molds. Now the easy part. Lightly sand the mold with 36 grit sandpaper to put small grooves into the mold surface. The scratches will vent the flat tool face but be small enough hnot to print thru into the part......

When this works, I'll let you send me a hi quality local beer for my collection.....
a nice Hefewiezen would probably hit the spot.....

Scott.