If they're acquiring the IP of your tech company, then it's possible that you won't personally have income until next year (when you liquidate your company). If you move this year then you could have no ties to CA during the relevant year.
You should do things like:
Give up your home here and get a home in NV.
Give up your drivers license here and get one in NV.
Change your vehicle registration
Change your voting registration
Track the number of days you spend in CA next year, and try to minimize it.
As others have said, the FTB (California Franchise Tax Board) may still come after you. I don't think this is terribly likely for a sum this size (no offense!). I know of a case — from back when I was a tax lawyer — where the FTB went after taxpayers who moved out of CA before having a huge (probably tens of millions) liquidity event.
At the time, I asked the partner handling the case how the FTB knew about this guy since the transaction happened after he left CA. IIRC, the answer was that they may track large published transactions and see if there are ties to CA. But since your transaction is much smaller, there's a good chance you wouldn't end up on the FTB's radar.
But even in the big case I described, the taxpayer won — and even got his attorney's fees covered by the govt because the FTB had been been overly aggressive in going after him. The lawyer in that case was Roburt Waldow [1]. It looks like that case is still the first one on his list of experience — probably because it's notable to get attorney's fees awarded. If you contact him, he'd probably give you his two cents free of charge (especially if you tell him you heard about him from his former colleague Nick).
1: https://www.sheppardmullin.com/rwaldow#Experience
NOTE: I am no longer an active attorney with the CA Bar, and this is not legal advice :)
