Corpse runs are a lot easier now it allows you to pick up your stuff even if its more than your none belt weight, this makes it a lot easier to pick up and run.
To do the Swamp just make a decent base to retreat to, and then take on the enemy piece by piece... its not a zone you can run into and 'deal' with it, no work your your way through it... use the hoe to level ground to fill up some water ways, and make the run back with iron easier.