The difference between the intended drop rate and the actual drop rate is very minor actually. These recipes are not meant to be super rare. Less than 0.5% of actual deviation between the two.
The problem was with the thing beforehand where the designs were incredibly and unnaturally rare which was fixed completely today with this change.
Sorry I found your post a bit confusing, can you please confirm what you meant.
Are you acknowledging that before today JC pattern drop rates were incredibly and unnaturally low, and today that was fixed but may have been turned up a little too much (0.5% as you say)?