Replay angle

[Tony]

I have some holograms in which I shoot at say 56 degrees but to get maximum brightness and correct color the illuminating light (with the finished hologram) has to be almost normal.
Is this a post exposure problem or a set up problem.
I say post exposure since perhaps it could be color shifted too blue and requires tilting to get it more red or broadband.
This is a single beam set up.

Also, there are holograms in which when illuminated, I can see the reflection of the light source bouncing off the glass. Any tips on avoiding that? Do I need to shoot at a steeper angle?

Thanks

Sorry this in under DCG but it could be related to DCG since the replay angle is so wide.