FWIW, I use a fine needle in my 100LG for everything but clearcoats. I spray mostly acrylics, with some enamels. I thin them quite a bit, and have never had any problems whether spraying fine detail or general spraying. In fact, I painted this entire aircraft with the 100LG and a fine needle, and it was the first plane I painted with it:
Up until then, I used a Badger 200 for everyting. Now, you couldn't pry my 100LG outta my hand for anything!