I've worked for 4 different quant hedge funds and interviewed with about a dozen others to reach final stages and comp negotiations.

I can claim with full certainty that comp is entirely discretionary and is not beholden to any "percentages". They pay you min(market worth, amount to make you stay) - and those figures are reviewed every year.

Percentages only apply to discretionary traders who are allocated a book to trade. They get to keep a certain percentage. For everyone else, especially techies and researchers, it's discretionary.