If you're Gold you should have "last seat on the plane" accessibility for standard awards so there's really no need to lock it in especially if there are multiple flights a day and potentially multiple routings (aka it's unlikely every seat on every routing for the days you need will be sold out before you have to truly make a call on whether saver has been / will be released). Especially since this is domestic - so locking in partner availability is irrelevant as well.

Just monitor availability and as long as they're still selling revenue tickets in theory you should as a Gold be able to get a standard award up until the time they close the door on the plane. You'll pay the close-in fee but otherwise you won't pay anything else and either no saver opens up and you take a standard seat or a saver opens up and you snag that.