You will become a WN flyer. To fly to SMF via SFO to visit Martinez is near-lunacy. If you're going to be flying SEA frequently, ask AS for a status match. Get a Priority Pass, which will give you SNA (UA Club) and SEA (AS and UA club) access.
Do not, do not, do not rely on UA for reliable SFO short-haul connections.
Check out sigalert.com if you want to see traffic conditions at various times.