Who is using the Bilinear bed levelling in Marlin 1.1? How many samples are you taking? What sensor are you using?
I am using an inductive sensor, and am currently doing a 55 grid on my 400400 build area, I am considering sampling a lot more prints - maybe 8*8 or more?? I suppose the only thing I have to loose is a tiny bit of time at the start of a print.