How can I make my crinkles less dry?
You could try replacing part of the sugar with a liquid alternative: molasses, maple syrup, honey, et cetera. You don't need to modify it much to start with, try replacing 10 grams of the sugar with 10 grams of an alternative.

Volume conversions can be found in section 1.2 of

http://realfoodliving.com/faqs/sweeteners-faqs

but I can't find any weight conversions.