I'm always willing to answer if I've seen the question; if I've missed something, please ask, and I'll always make sure to go an extra mile.
To me El from ancient Hebrew means the Source - 'A' implies positive strength, 'L' implies a path, thus a Strong Path/Source of reality (God).
I don't accept any legitimacy of Hadiths, I understand that is where people's ideas come from, so I've looked into ideas; yet I generally always will go back to original ideas found in the more ancient texts.
Of course there is a methodology, and already stated it; if a Hadith aligns with all of the prophetic standards prior to it, and in all data that fits in the Jigsaw Puzzle God has provided across all the books, I'll still question that Hadith as to what additional factors is someone trying to impose, and in what way does it edit the original standards.
If a Hadith did fit, and didn't actually change any of the previous revelations into something bad, then I might adopt it as being useful, yet generally that doesn't happen.
El Elyon is the God Most High, it is the Source of reality...
In Isaiah 46:9 it reminds us that 'El is not like the Elohim', citing Deuteronomy 32:7-9 where 'El Elyon the Source separated the nations among the Elohim (Divine Beings), and gave the nation of Israel to Yahavah'.
So we have the Divine Council (Elohim) who have names, and interacted with mankind, and we have the Source El who is beyond all names, images, and form, as it is the Source of all reality.
Anything that has a name or form, is not the Source, as it creates all of that, which is why in ancient times, it just had the placeholder 'God Most High'.
In my understanding in Arabic 'Ala Ilah' can be God Most High, when we look how many times Allah is placed in the same qualification as the God Most High, 'Ala Ilah' is shortening of the Arabic to make Allah, removing the vowels.
It clearly states never has Allah directly spoke to mankind (42:51), so when Moses spoke with something, that is Yahavah Elohim the head of the Divine Council.
I honestly don't go looking into most likely falsified texts, I've studied some of the ideas, when looking into why people claiming to be Muslims do not follow the Message of Allah.
Not aware of what it is specifically without studying it, so will need to provide a link to research it.
In my opinion.