So my flooring is luxury planks, tongue and groove. Every so often I come to a plank which is very difficult to get to sit up against the next one perfectly, so that no seam is visible. I've tried everything I can think of...taking it out again and re-angling, tapping block, etc. The problem shows up particularly at the end of the room, where the last row needs a pull bar. Even using the bar I still seem to get this annoying little gray seam left visible. Worse, though I didn't notice this at the time, there are a couple of planks like this in the middle of the room that show this gray edge when they catch sunlight. It seems that the slightest tiny misalignment causes this and the manufacturers shouldn't have used gray along the edges of their planks. Is there a way to fix this?