_____

[Mahakali]

they also directly contradict each other many times

Do you have any examples? I'm curious about this, as I haven't noticed any direct contradictions so far, myself.

For example, in Unknown Reality, Seth says that there are no such things as discarnate negative entities, and that if one encounters one it is merely a thought form of one's own creation, i.e. all "negative greeting" is created entirely from within one's own psyche. Ra obviously differs in their opinions on this matter. 

He might just be referring to the fact that, in the astral realms, the self can't be damaged, and all negative experiences there are as a result of one's allowing them through their belief system and ideals. Even Ra stated that the discarnate negative entities feed on fear, so, in that sense, you are creating the negative greeting by resonating with it emotionally, whereas Seth is simply looking at the same set of facts from a slightly different perspective?

I've only just started the Seth material, so I guess I'll have to read more of it to be sure, but that one doesn't seem difficult to reconcile.