descr_campaign_db.xml

Code:
   <religion>
      <max_witches_per_region uint="1"/>
      <max_witches uint="20"/>
      <max_heretics_per_region uint="1"/>
      <max_heretics uint="80"/>
      <max_heretics_conversion_modifier float="1.0"/>
      <max_inquisitors_per_region uint="1"/>
      <max_inquisitors uint="40"/>
      <heretic_conversion_rate_modifier float="0.0075"/>
      <heretic_conversion_rate_offset float="0.025"/>
      <witch_conversion_rate_modifier float="0.0"/>
      <witch_conversion_rate_offset float="0.02"/>
      <inquisitor_conversion_rate_modifier float="0.010"/>
      <inquisitor_conversion_rate_offset float="0.04"/>
      <priest_conversion_rate_modifier float="0.004"/>
      <priest_conversion_rate_offset float="0.015"/>
      <witch_creation_modifier float="1.0"/>
      <heretic_creation_modifier float="0.4"/>
      <inquisitor_creation_modifier float="0.3"/>
      <min_cardinal_piety uint="5"/>
      <convert_to_heretic_base_modifier float="10.0"/>
      <convert_to_heretic_unorthodox_modifier float="0.7"/>
   </religion>

max_inquisitors seems an obvious one to mod down, to reduce the number from a potential 40 on the map at any time. inquisitor_creation_modifier float? Reducing may also limit the problem a little (if there is one). Not sure about the 2 conversion rate figures.