Incrementing Unarmed Die Type

[DeathSheep]

Just a syntax question today I believe. I am trying to create a fighting style that increments your unarmed die type 1 step (1 to 1d4, 1d4 to 1d6, 1d6 to 1d8, etc.) Here is the entire fighting style, and I am sure I have the syntax all bollixed up, but not sure what it should be:

  <thing id="cXXXPRBrawler" name="Brawler Style" description="You are skilled at using your weight to your advantage. You gain the following benefits:\n\n- You are proficient with improvised weapons.\n- Your damage die for your unarmed strikes and natural weapons increases by one step (from 1 to d4, d4 to d6, or d6 to d8).\n- When you take the Attack action and attempt to grapple, shove, or trip a creature, or make an attack against a creature with an unarmed strike or a weapon wielded in one hand on your turn, you can use your bonus action to make an unarmed strike, grapple, shove, or trip against the same creature." compset="CustomSpec" uniqueness="unique">
    <tag group="abCategory" tag="GrdFight"/>
    <tag group="Helper" tag="Secondary"/>
    <tag group="abRange" tag="Personal"/>
    <tag group="abDuration" tag="Constant"/>
    <tag group="WepProf" tag="w5CImMeWe"/>
    <tag group="WepProf" tag="w5CIMRaWe"/>
    <bootstrap thing="wUnarmed"></bootstrap>
    <eval phase="First"><![CDATA[      ~ If we're disabled, do nothing &
 
      doneif (tagis[Helper.Disable] = 1)

      ~ Push all weapon proficiencies to the hero

      perform hero.pushtags[WepProf.?]]]></eval>
    <eval phase="First" index="2"><![CDATA[      ~ If we're disabled, do nothing 
 
      doneif (tagis[Helper.Disable] = 1)
      
      ~ Increment unarmed damage one die type
      if (wUnarmed.wDieCount.value = 0)
      perform wUnarmed.wDieCount.value = 1
      perform wUnarmed.wDieSize.value = 4
      done
      endif

      if (wUnarmed.wDieSize.value = 4
      perform wUnarmed.wDieSize.value = 6
      done
      endif

      if (wUnarmed.wDieSize.value = 6
      perform wUnarmed.wDieSize.value = 8
      done
      endif

      if (wUnarmed.wDieSize.value = 8
      perform wUnarmed.wDieSize.value = 10
      done      
      endif

      if (hero.wUnarmed.wDieSize.value = 10
      perform hero.wUnarmed.wDieSize.value = 12
      done
      endif]]></eval>
    </thing>