Zoukei-Mura 1/32 A1-H Skyraider assembly issue

In assembly of outer wings, the instructions say to shave off 0.5mm from tops of spars B-25 and B-29, and then later glue parts B-29 and B-30 at the same location. These latter parts are about the same thickness as what they tell you to shave off in the first place. Why? The original height of the wing spars already look like they will be flush with the inner wing surfaces. I sent an email to Zoukei-Mura… crickets! I’m tempted to ignore the instructions. Anyone have this same question/issue with this kit?

Thanks for any help.