I would suggest removing from boiling water and draining in a colander. Then, removing to a cookie sheet so that the dumplings are in one layer, and more moisture can flash off. If you are making large batches, I assume you are adding a further cook or re-heat step to finish.
I am new to cooking and had the exact same question. I have an idea.
Boil the potatoes
Cook them with spice.
Make cubes from mashed potatoes.
Now make curry from the reconstructed potatoes.
I am pretty sure this will get flavour inside the potatoes. Hope you like it! :-)