Wonky geometry at the top of my Wega's screen
So I got a KV-34HS420 and noticed that the edges were being cropped off a bit. I managed to get to the service menu and changed the values MDHS, MDHP, MDVS, and MDVP. I was able to uncover the left and right sides but the top (and bottom to a lesser extent) have this weird thing going on outside the original visible area. I can't get a picture but I've recreated what I saw by editing the test pattern I used.
Is this something I can fix with the service menu? I'm not very experienced with CRT settings (and I probably shouldn't be messing with these values because of this) but I'd like to at least try. Or is this something unfixable that needed to be covered by the overscan in the first place?