Keep the export to CT enabled but untick the Limit to Load. Mine does the same however when the limit to load is un-ticked I see the total house usage being displayed on the inverter screen which matches what Solar Assistant reports on. (Essentials and non-essenetials being displayed).
Also when you have "limit to load" enabled then any access PV power in day will only supply your essentials, all non-essentials will use ESKOM so have it unticked if you want the non-essentials powered by PV via the CT.