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My reasoning behind the way it's currently set up is that Firefoxes is a more solid block, and Serpent has a higher minimum value if they play around it (since I'll normally pull the animals with 2x2, so they'll know what I'm grabbing). I could see possibly switching them, but why do it for the use of enhancements if I can get a block without enhancements?
I have found this post very useful, but some of the abbreviations and short hand make it very difficult to figure out what you're talking about.