I do find that this needs more liquid if I make it with American AP flour, which is normally around 10-11% protein, instead of pastry flour/AP cut with cake flour/Wondra. The other instance in which I find I need more liquid is if there hasn’t been enough layering/mixing of the butter cubes with the flour, so that there is a lot of loose flour remaining when adding the liquid.
Also, just wanted to check that you are using more cream than water, the amount of cream is equal to the water plus vinegar, but you still include the vinegar. For example, if the recipe calls for 1.5T of water and 1.5tsp of vinegar, then you sub 2T of cream for the water (1.5T + 1.5 tsp) and still include the 1.5tsp of vinegar.