Face decal not wrapping far enough round head / has seams

hi so im working on a game, and because of a limitation we decided to use custom rigs instead of r15 rigs.
the problem is with the custom rig, when i add a face decal it doesn’t wrap far enough around the head and it cuts the face off at the sides. on the r15 rig this doesnt happen. anyone know why this is happening and how to fix it?

image below showing the problem
1 is r15, 2 is custom

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