I'm hoping that the SHT-light and durable have the same toe-box width as the 304s. I just grabbed another pair of 304s if they don't.
I think the padding on the 304s is excessive (though I realize some people love Yonex for that) but I've never found a shoe that fits my foot better. I can do 4 hours of singles play in a pair of 304s and my feet feel like I just put the shoes on. When I wore Nike, Adidas, or Prince, my feet would be aching.
If the durable are truly more durable, then I'll also have a good set of practice shoes instead of heavy Prince NFS-lasted shoes.