horizontal oriented .bb-bookblock size in percentages + self.end

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I am trying to define bookblocks using percentage values (100%/100vh) and in horizontal orientation this ends up with a split line running across the top during transition, which is very obvious when trying to 'flip' full-screen images. The top half appears to shift a pixel or two, and my best attempt at a css fix resulted only in moving the split line to the middle instead of the top. This problem does not occur in vertical orientation.

I am also interested in doing nothing when trying to flip prev/next at self.end, but defining rotateX as 0°/180° breaks bookblocks altogether (ceases flip anywhere). Interestingly, at this point the page is frozen with the split line.

I would additionally be very grateful if mouse scroll control could be implemented similar to Scrollify, although I am trying to figure this out myself. That being said, the above two issues are top priority. Many thanks!

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Possibly noteworthy that the split line bug is exclusive to percentage values. It is not observed when defined using pixels.