RTV is the best stuff to use, but cleanliness and flatness is always top priorities. Not sure if you have a steel or aluminum pan on your Neon, but checking for straightness is always a plus. Any time I have a pan and a gasket surface, I always check it with a crosshatch of sandpaper to ensure it is in fact flat and no high spots (which happens mostly with metal pans), and at the same time, will dimple all the holes outward to prevent leaks, works every single time. At the same time, aluminum and metal bolts can easily, if the fluid has been changed a time or two, pull threads outward a little bit, enough to make you think the bolts are tightened properly but really aren't. First thing I would try in your case is tighten the bolts to what the book says, 100 inch pounds is less than 7 lb foot torque, which may be just a little bit on the light side, 165 inch pounds is a little more than 10 lb foot torque, and you could actually safely go up to 12-13 lb foot torque safely.