the drow dont live completely in jungle. first of all, there are most likely clearings for the *giant* ruins. second of all, as stated in secrets of xen'drik, jungle covers the upper peninsula, but there are great deserts and temperate plains farther south, and it doesnt state that drow only live in the jungles close to stormreach. furthermore 120' darkvision is subterranean darkvision. lightblindness as far as i know applies mainly to underdark drow. duergar and such have light sensitivity. because the entire race doesnt live at the bottom of a jungle 24/7, it doesnt make sense to give them subterranean darkvision. 60' darkvision or low-light vision makes more sense. by the way a jungle is not absent of light, thus low light vision. such. as. elves.
i wasnt actually against the charisma penalty, but the constitution penalty. basically apply the reason why wild elves dont get a con penalty to this case, and you'll see why it makes sense. the scorpion venom thing shouldn't be applied to an entire race, because as you mentioned its ritualistic not racial.
your argument for having saves vs. spells would then probably apply to most humans on khorvaire, as well as everyone on sarlona having saves vs. powers, etc etc.
i refuse to accept a poorly explained stat block based on a nerfed forgotten realms drow mixed with leafing through the few hundred (seriously, thats all) words written about them in the eberron books.