Have you pulled the spark plugs? I have heard sometimes you have antifreeze dripping off of those, which is a bad sign.
ScottyKilmer.com recommended Real Steel for head gasket leaks. I may have lost all respect for him right there, the Hugh Jackman movie might be better for your car than some weird product, but he pointed out that there were not any dissolved solids, so it should not clog anything. I also like Eric the Car Guy, but find Scotty to be slightly annoying. Here Eric shows parts after someone uses Stop Leak and it messed up everything: