How long have you been performing evocation?
These things take time to develop (astral senses)
I’ve been performing evocation for well over a year and still don’t get full manifestations.
But I realized that lusting after the phenomenon instead of results will get you nothing.
Call a spirit,issue a task and dismiss it even if you can’t see it.
The best way to open your sight to spirits is to just keep evoking.Don’t give up.
I’m just now starting to see vague outlines every now and then and only if I’m in pitch darkness.
I’ve worked with Sastan and he’s been nothing but good to me.
He once told me “You have viewed the spirit world your entire life.Every time you close your eyes and see images you are viewing our world.DO NOT mistake this for imagination”
So I doubt he is doing that to you.
Just go into the ritual expecting your goal to be accomplished instead of just wanting to see the spirit.
Scrying into a black mirror has helped my sight ALOT.
The physical manifestation of spirits doesn’t happen as quick as it is marketed to.
Keep it up and you will start to see changes.