I don't call a 1.5% change big. A more appropriate title 'Small UI changes, less results'?
I have changed the wording on pages before to get 40% better conversions.
I have changed the wording on pages before to get 40% better conversions.
Did you check to see if the conversion to paid fluctuated? I would be incredibly surprised if it did more than 0.5% from the start of the trial to the end.