Thank you, looks like a great read, although right off the bat someone is saying to not use a drop checker which nobody else online says to do
While I can't tell the poster's qualifications they did give the answer I was looking for:
"Myth: A Low KH results in a larger pH swing when adding CO2.
Many people are under the mistaken impression that a low KH results in large pH swings when adding CO2, while raising the KH will result in smaller pH swings. This is not the case. The KH will move the start and end pH values, but the pH swing will be the same for a given level of CO2. You can see this in the chart below, or using the calculation:"