I put foil under the board, as mentioned above, but that alone didn’t do the trick for mine.
I had to tweak a few R values differently; ended up with these:
R1 from 470k to 660k (330k + 330k series)
R5 from 560k to 820k
R8 from 560k to 820k
R11 from 750k got 2.4M in parallel (1.2M + 1.2M, so about 570k total).
Hope this helps the next tinkerer.
Cheers ๐