Angling on each side is normal, but all depending on HOW much they lean! Just a little...
Solid spacers are a must! When you make the spacers, keep in mind that as they get taller and grow in height, they will also have to move slightly in the direction of the angle lean so the injectors aim straight down their bore, otherwise yeah you'll be spraying the walls.
I had similar issues with a set of racetronix injectors, but I think yours are even taller.

Also, it sounds like you have the wrong o-rings. They should spin if forced, but definitely not too easily.

Check all the o rings I just went through!