Hey, I feel your pain, and a good write up on your journey. I too have been struggling to get my A350 bed leveled, and have undergone almost the same process as you have here, and I know its alot more work but I believe a 7 X 7 grid and perhaps a 9 X 9 are better suited to the large bed size of the A350. That being said, I am still tweaking my 7 X 7 and finding first layer adhesion is not perfect every where. I think we can get there, only a matter of time. Looks like @xchrisd managed to get his A250 dialed in for an acceptable initial layer On achieving a perfect level.