Sorry to supersede you here Matt, but the bug-eye is absolutely associated with the gene. It has to do with the melanocytes not forming a proper basement layer in the developing eye-cup.
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I would rescript this as below:
Bh (-10) ------------------- Normal (0) ------ Cypress, SN, Sable (4) ------------ Champagne, hgw, woma (7) ----- Spider (10)