X feed valves are either Open or Closed, not On or Off.
During single engine operation, once the fuel is within balanced limits, then the remainder of the flight can be flown with the X Feed Open and all Fuel pumps On.
A regular watch must be kept to insure that any further imbalance does not occur.
You have other things to worry about apart from fuel balancing.
Fix it once and leave it alone.
Don't make a major drama out of a minor crisis.