Thank you for the input. I have all the information gathered, so there really isn't any issue with that. There are just quite a few pieces and it gets complicated (13 different investment accounts: 2 Roth IRAs, 2 Traditional IRAs, 2 Rollover IRAs, 2 active 401(k) plans, 2 529 savings accounts, 3 brokerage accounts), on top of a large amount of company stock about to vest and cash payment upon an impending severance. I think I'm just going to find a fee-only financial advisor here locally to help me get everything sorted out.
Honestly, that's not even that many accounts. Your example is just what someone's accounts would look like if they were a married working couple, with a few kids.
Think of your accounts as different pots. You have your Roth pot, your IRA pot (tIRAs + rollover IRAs), 401ks, and after-tax pot (brokerages).
You state you are retiring at 42 later this year, congratulations! As you must have had to learn and apply a lot of advanced FIRE strategies to achieve such a goal, you should definitely have the acumen to learn the drawdown strategy.
Also, your main questions are about draw down and manipulating your income. You are very unlikely to find any financial advisor that is "well-versed" in these topics. They just aren't set up to learn this type of information as there isn't really a market for FIRE financial advisors. There is DEFINITELY no financial advisor that can offer as good advice as what you would get in a case study here.