Herochat /msg configuring?

Hello, me and my friend run a server with HeroChat, and we wanted the /msg format to only display the player usernames, not their prefixes and username. Here's our current config:

Code:

moderator-permissions:
  can-kick: true
  can-ban: true
  can-mute: true
  can-remove-channel: true
  can-modify-nick: true
  can-modify-color: true
  can-modify-distance: true
  can-modify-password: true
  can-modify-format: false
  can-modify-shortcut: false
  can-modify-verbose: true
  can-modify-focusable: false
  can-modify-crossworld: false
  can-color-messages: true
  can-view-info: true
  can-focus: true
default-channel: Global
censors: []
format:
  default: '&r {sender}: {msg}'
  announce: '{plainsender}: {msg}'
  emote: this isnt even being used. #ignore this, we use something else for the emote
  private-message: '&8[{convoaddress}: {convopartner}&8]: &7{msg}'
use-channel-emotes: false
locale: en_US
log-chat: true
log-to-bukkit: false
twitter-style-private-messages: false

 

private-message: '&8[{convoaddress}: {convopartner}&8]: &7{msg}'

private-message: '&8[{convopartner}&8]: &7{msg}'

Provided that {convoaddress} is the sender, change that line as shown above