Control when an investment is running

[Penchant]

Can the control of a region be at core while the production is booming?

[Velax]

Yes.

[fodder]

there's only a dip right when you hit investment.

if it's a well run region, it'll bounce back to core all by itself the next morning..

[Cren]

Otherwise perform a harsh court and next turn perform a mercy court to counter the morale loss.

[Indirik]

Or invest and then immediately do normal police work. This usually gets you back to Core right away.