Vignetting with f/4

So we discovered that I wasn't seeing the aperture properly. We fixed this and now aperture is at f/4. Results below are similar to before. r = 1000 drops from peak to about 0.6 in flux.

M: 1.000000e+00 + 1.177149e-05 x + -3.625043e-07 x^2

B: 1.000000e+00 + 1.658033e-05 x + -3.557655e-07 x^2

G: 1.000000e+00 + 1.073046e-05 x + -3.621431e-07 x^2

R: 1.000000e+00 + 1.441878e-05 x + -3.701124e-07 x^2

R:

G:

M:

B: