A few things you're ignoring here Advent:
The quotes DO exist.
"Palpatine has spent decades studying the most arcane and esoteric Jedi disciplines. He has mastered all the known powers, previously unknown powers, and devises knew ones at his pleasure"
Here's another one:
"He had succeeded where all others had failed in taming the Dark Side."
Both from the Dark Empire Sourcebook.
Also I find it interesting that you'll continue to claim that Exar Kun created his form from scratch when you and I both know full well that Jedi vs Sith confirms that he learnt it from the remnants of the Jedi Exiles.