Unusual Google PM Compensation Situation

Had on-site for Google PM (L5) & my recruiter told me to expect to hear back from HC in the next week or so. I might be getting ahead of myself, but this has prompted me to think about compensation.

I think I'm in a decently unique circumstance for negotiating. In terms of my current work & comp, I'm juggling a couple different balls:
- Fractional CPO/Product Management Consultant for 4-5 clients a year @ $120-250/hour with pre-determined retainers & engagement lengths
- Data Science & Machine Learning Consultant for 2-3 clients a year @ $140-280/hour with pre-determined retainers & engagement lengths
- Due Diligence & Expert Network type work for VCs, PEs, HFs , etc. a couple weeks a year @ $160-$280/hour (fairly variable)
- Partner in an events company that personally nets me ~$50,000/year which I have to be operationally involved in (wouldn't be able to if I took Google)
- Partner in a niche digital marketing firm that nets mw ~$80,000/year which I also have to be operationally involved in (wouldn't be able to if I took Google either)

My total yearly compensation varies with how much I work & what deals I put together:
2016 - $205k
2017 - $220k
2018 - $243k
2019 - ~$275K (pro forma)

Note: this is working about 10 months a year living in a relatively low COL (TX) compared to the MTV or NYC (the two places I'd consider).

I know Google low-balls unless you have a competing offer from a public company. I wasn't looking for a job when Google reached out, but I given it was Google I figured I'd give it a shot; as such, I haven't interviewed with any other companies.

In my case, could I ask Google to match or at least approach matching my average yearly earnings along with a small COL adjustment? Statically, the Bay Area is about twice as expensive before accounting for state taxes as where I am currently; I don't expect Google to double my current income of course, but I'm wondering if that would be factored into my compensation.

It's taken a good bit of failing & struggle, but I know my current setup is pretty sweet. That said, I'm fairly weary of working completely independently 95% of the time, hustling for deal flow, and living in TX. I've been finding myself wanting more and more to be in an environment surrounded by world-class people I can learn from & grow with, focusing on crafting a single product, & moving back to SF.

Also, given I don't a competing offer from a public company to leverage would I be able use my tax filings from previous years to show current compensation to match/use as an anchor?

Any advice is appreciated.
Thanks!

TC: $275k
YOE: 6