Need Help With Top Plates

New builderhaving much frustration trying to true my plates for the top. I made a shooting board, clamped my sitka spruce and began with a block plane. Not having done this before, I was overzealous and before I realized it, I took too much off. Now I have the edges just about perfect, but I can still see light when I hold them up to the window. Does anybody have the technique to get these edges perfect and ready for gluing?

Jim