No, reduction in conventional commute trips is measured against a baseline of 100% conventional vehicle use, not on a reduction of trips compared to your previous performance. Assuming your survey method and other credit documentation are compliant, you have already earned 6 points by reducing conventional trips by 25%.
Question
Do we need to document that we reduced commuting trips compared to our baseline? For example, our survey results show that conventional commuting is reduced by 25%. To get the points for meeting the 25% threshold do we need to reduce conventional trips by another 25%?