My ideal map list(changes from what you posted):
Also remove Vittra, Isle of Greif, Intersection, Barren.
All these maps are very small and have lots of "safe" metal(barren not really but it sucks anyways), which I believe makes for terrible gameplay.
Like the remove list. Obisidan is a decent map but I can't say I really like playing it.
Add list
Gecko isle has a terrible metalmap. Such concentrated areas of metal means lots of porc.
Would add Iceland, Cold snap, blue bend, and Archer's valley.