Great news to hear you are liking the Gcon's so far and have seen a substantial upgrade from prior options. Ok, as for the specs, the "optimal" specs are a mixture of where I prefer, where modeling them gives a nice response curve and where the user gains a little efficiency and maybe a pinch of later roll off. Now, for most installs that have power on the upper range of the speaker's comfort zone, the standard enclosure design suggestions are the best direction to go for. With your amp and goals, I think the Khaotik Enclosure will serve you well, but if you would like to reach up into the 2.5 or 2.75 range per, DC Creations is a great option for a custom enclosure. Hope that helps.