In the current state of things the process is heavily defended by the HR department and most ICs want to have an "objective" way to be promoted and have a raise, when there's very little in this to be "objective", making it almost impossible to dismantle.
In more than 25 years in the industry, I haven't been once in a company that solved this conundrum and makes me want to quit being a manager.
A good book I've read that I can suggest if you're painfully struggling with this, is "Abolishing Performance Appraisals"