Also, this list downplays the Cthulhu Mythos hard. Like, Hypnos reached infinite levels above baseline 1-A, and he got BTFO'd upon reaching the First Gate:
"There was a night when winds from unknown spaces whirled us irresistibly into limitless vacua beyond all thought and entity. Perceptions of the most maddeningly untransmissible sort thronged upon us; perceptions of infinity which at the time convulsed us with joy, yet which are now partly lost to my memory and partly incapable of presentation to others. Viscous obstacles were clawed through in rapid succession, and at length I felt that we had been borne to realms of greater remoteness than any we had previously known. My friend was vastly in advance as we plunged into this awesome ocean of virgin aether, and I could see the sinister exultation on his floating, luminous, too youthful memory-face. Suddenly that face became dim and quickly disappeared, and in a brief space I found myself projected against an obstacle which I could not penetrate. It was like the others, yet incalculably denser; a sticky, clammy mass, if such terms can be applied to analogous qualities in a non-material sphere."
"I had, I felt, been halted by a barrier which my friend and leader had successfully passed. Struggling anew, I came to the end of the drug-dream and opened my physical eyes to the tower studio in whose opposite corner reclined the pallid and still unconscious form of my fellow-dreamer, weirdly haggard and wildly beautiful as the moon shed gold-green light on his marble features. Then, after a short interval, the form in the corner stirred; and may pitying heaven keep from my sight and sound another thing like that which took place before me. I cannot tell you how he shrieked, or what vistas of unvisitable hells gleamed for a second in black eyes crazed with fright. I can only say that I fainted, and did not stir till he himself recovered and shook me in his phrensy for someone to keep away the horror and desolation."
There are several Gates before the Ultimate Gate, not just the First Gate:
"Randolph Carter's advance through that Cyclopean bulk of abnormal masonry was like a dizzy precipitation through the measureless gulfs between the stars. From a great distance he felt triumphant, godlike surges of deadly sweetness, and after that the rustling of great wings, and impressions of sound like the chirpings and murmurings of objects unknown on earth or in the solar system. Glancing backward, he saw not one gate alone, but a multiplicity of gates, at some of which clamoured Forms he strove not to remember."
In conclusion, the Outer Gods should all be at least countless degrees of qualitative transcendence above baseline 1-A.