Tweaking reflection vector for cube map fetch

i try to get rid of artifacts on OVSM caused by bilinear filtering. i want to tweak the reflection vector i use in textureCube() so that pixel fetches at borders of cube map faces are pushed a bit toward the center… say this is one of the faces:

if the vector is rotated so that it’d fetch a blue pixel, i want to adjust it so that instead its neigboring red pixel is fetched.

is this possible? thanks!

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