I'm very surprised. The instructions clearly state "most people would use..." I suggest you call a banker who's done a few thousand of these.
My experience - and I ended up getting approved and funded:
1) Used entire 2019 payroll off W3.
2) Add all federal & state employer taxes.
3) Add health insurance premiums.
4) Add all 401K employer contributions.
5) Subtract excess of $100K payroll per employee. Note - the taxes, health & 401K may take you over the $100K per employee, but thats ok. Only look to make "gross wages" limit at $100K.
6) Divide entire sum by 12
7) Multiply by 2.5
Submit W3 & 941's as proof.
Can you use Q2,3,4 2019 & Q1 2020? Yes, but good luck getting your bank to work with that, especially if you 941's are not ready