Success! I got other Tabs to load data while using the Product:SKU argument with,
$node = node_load(arg(1));
for a Provide default argument > PHP Code argument type.
But, it only works WITHOUT AJAX, "No: Load all tabs on page view." I of course would like to use the AJAX feature but I'll have to wait until I can figure out the proper argument to use with that.
I also tested this with an additional third tab and its all loading great and for the proper product being viewed! NICE