Randy Holmes-Farley
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My Tank Thread
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I'm in the same predicament and kalk raised my dkh from 9 to 14 while only raising pH from 7.5 to 7.8. You mentioned it was the excess co2 in my room.
Seems for myself and others in this situation the only solution is an air exchanger (seriously considering) or adding a sizeable Fuge split in half to allow one side to run during the day and other at night with each on differing light schedules based on tank demands. Latter seems easy enough if one has the room but an air exchanger likely best as it also benefits the humans and other pets in the entire house.
Air exchange certainly is a solution.
How effect any other solution is varies a lot with the ambient CO2, and the degree of tank top aeration relative to whatever means you are using to reduce CO2.