i have the same problem with my eggs no matter what i do it still drips put a paper towel over them so they dont get too wet and change it out every couple of days make sure your temps are correct in the tub vs the incubator temp sometime it drips cause the temps are different hope it helps
You could try putting something under the front of the tub. So the water runs to the back of the tub. I will be using this method this year when and if the eggs arrive. I will be using washers or quarters a slight slope is all that is needed. Good luck with the eggs.