Anyone have problems with Tandem/Dexcom G6 Insulin Duration preset to 5 hours?

Typically, my IOB time is 3 hours, but when I turn control IQ on, it's preset to 5 hours which essentially gives me incorrect (under) bolus amounts. Another way to think of this is imagine you bolus 40g for dinner; 2 hours later with a 3 hour IOB my remaining amount would be 13.3g as opposed to 24g with a 5 hour duration. I find myself overriding my corrective dosing all the time.

Is their a more simple way of dealing with this?

Thank you for your help!