Utility: new Battle Simulator map

[Mysterio]

Need some help understanding what I'm doing wrong. I'm trying to understand how my MA Caelum units and commanders would fare against MA Man's units. So I'm trying to have my commander attack a Man province with 20 PD. My BattleSim_v3.map file looks like this:

--
-- Map file for Dominions 3
--
-- Illwinter Game Design
-- www.illwinter.com
--

-- Title and image file
#dom2title Battle Simulation Map
#imagefile BattleSim_v3.tga
#domversion 175
#defaultmapzoom 0.8
#description "This map is only 10 provinces. It speeds up testing by making it easy to reach locations. Or it can work for a very fast two-player battle."

-- Province names/terrains
#terrain 1 4227592 - Border Mountains, Fresh Water, No Start
#terrain 2 2052 - Sea, Deep Sea
#terrain 3 2 - Plains (default terrain), Large
#terrain 4 4194816 - Border Mountains, No Start
#terrain 5 577 - Waste, Small, No Start
#terrain 6 258 - Farmlands, Large
#terrain 7 4608 - Cave, No Start
#terrain 8 131106 - Swamp, Large
#terrain 9 641 - Forest, Small, No Start
#terrain 10 4194944 - Border Mountains, Forest, No Start

#landname 1 "Walden Pond"
#landname 2 "the Deep Blue Sea"
#landname 3 "Main Lyonthe Plains"
#landname 4 "Rockina HardPlace"
#landname 5 "Watta Waste"
#landname 6 "Marvin Gardens"
#landname 7 "Deep Praved"
#landname 8 "Bog of Eternal Stench"
#landname 9 "Yew Are Here"
#landname 10 "Knot Here"

-- Province neighbours
#neighbour 1 3
#neighbour 2 3
#neighbour 2 5
#neighbour 2 6
#neighbour 3 8
#neighbour 4 8
#neighbour 4 10
#neighbour 4 7
#neighbour 5 9
#neighbour 5 6
#neighbour 6 8
#neighbour 6 9
#neighbour 8 10

--

#specstart 38 4 - MA Caelum starts in P4
#specstart 30 10 - MA Man starts in P10
#land 8 - It's my understanding that this command should wipe out the swamp in P8, but P8 remains a swamp

#setland 4
#owner 38
#commander 629 - Create Stalker commander in P4 for Caelum and equip with items. All of the lines in this section work
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"
#additem "(item name here)"

#setland 8 - It's my understanding that these three lines should set ownership of P8 to Man with a PD of 20, but they don't do either
#owner 30
#defence 20

So, what am I doing wrong that's causing P8 to remain a swamp, not switch sides to Man permanently (indies take it over if I host the first turn without doing anything), and start with a PD of 20?

Thanks!