Originally Posted by
IAH-OIL-TRASH
I'd do same-day change (available to do night before) to later flight PHX-SFO if you can.
OP is coming from PHX (aka, "the oven"). Stick with the long layover, check your bags with the travel agency at SFO, and enjoy a nice cool day day by the bay
(I'll second the Marufuku recommendation btw - have only been to Oakland location, but it is by far our favorite ramen.)