Hey Andrew. Thanks for the good vibes. There is definitely a LOT of hating going on. Fact of the matter is, making my own medicine has already saved me money from time of purchase......no leg work, no headaches.....i don't think the 600 would cause any issues. the 400 was spot on for me.....ran around 73 - 75 degrees. i'll bet that a 600 would give you the perfect 78. once you are up and running, send pics...i want to see what you can do. GOOD LUCK!!!