It's not going to get accepted tbf. But you could better compare it with half the AP of Serious Punch Square, which is nearer to Saitama's full power
Saitama's growth is exponential. After a couple of punches he reached 59x (don't know why the hell people says it took the whole fight to reach that growth, when we literally see the function of their power growing from panel to panel at one episode).
Exponential functions (a^x) start growing slow, but once enough values of x have passed their growth is too fast. It's not that Saitama's growth is limited to 59x, is that Garou only allowed him to grow that far.
Given the nature of an exponential function, if Garou actually copied Saitama some times more, Saitama would've certainly multiplied his initial AP by a thousand of times at the very least... if he did not one shot Garou before.
Now, we accept Saitama being capable of reaching up to 3-A with his growth, so he is not limited to 59x his initial AP.