6 throw rule with 9 breakers?

[Stevenfyeager]

This doesn't even sound like a split buss panel. Could it be a sub fed main lug panel?
And if it is a split buss just move the single pole breakers (at least 3 of them) down under the main lighting breaker if there is room.
Or change the panel.

I checked, it is not a split panel, nor a subpanel. Thanks.