At most I would say he's at most near Vader's level. He seems to hold Vader and Palpatine in a sort of reverence. Of course that could change in the future. One of the new SW databooks gives somewhat of a hint what his future plans are. Kylo Ren is discovered by Snoke as a focal point that has the potential to use both the Dark side and the Light. Maybe he wants to possess Kylo in the future?
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
Maybe currently he's weaker but in the future will gain some power boost. As of now we simply don't know enough about Snoke, though I reckon he will be above the Emperor most likely. In fact I believe he might be a Canon Rakatan.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
The Star Wars site, when referring to Sidious, notes he's the most powerful evil of the verse until Episode VII(or something like that).
It seems to imply he's > Sidious.
You seem upset. Your inability to make your case coupled with your strong emotional sensitivity might readily explain your failure to persuade anyone of the idea that Sheev is below Kun and Krayt.