If you wait too long to return to Faust, the OddEgg will be rotten when you return via the repaired transporter in the Drone outpost. I would suggest you return to Faust after finding it and immediately completing the OddEgg battle.
You should also try to complete SQ#16 at the same time because Pauline, who is making a solution for Lance's stomach pains, is nowhere to be found when returning via the Drone transporter.
During my 1st playthrough, I returned to the Metal Fortress after the metalsmith (SW corner of workshop) was gone and Kraken offered to craft an item from ores. I did not have enough ores for him to do it.
But during my second game, I was not able to return to the Metal Fortress after returning to Faust via the Drone transporter. I would suggest this also be attempted when returning to complete SQ#11 and SQ#16.