How about another workbench improvement pre-swamp? Considering 2 existing leather armour sets in order to max level armour sets attained from the first 2 biomes can't be upgraded until materials found in the 3rd & 4th biomes have been reached is kind of pointless.

Use trollhide to make another workbench improvement to reach that max armour sooner. Maybe a Sawhorse/Sawbuck. Not sure what the Europeans call it.