Unable to successfully tram the bed

I’ve followed the guide to the letter for tramming the bed and am still unable to get the gap right.

I tightened all screws, loosened the left three turns and the right one turn. As I run the gcode for tramming from the guide, the front right screw needs to be tightened more, but it can’t be turned any more. The left side is perfect but the right side is still high and touching the nozzle. I’m no stranger to manually levelling beds, but what am I missing?