I'm not at home so I can't really check, but would macroing override self auto-target? It may be worth a shot.

/micon "Heal Name"
/ac "Heal Name" <t>

Or

/micon "Heal Name"
/ac "Heal Name" <mo>
/ac "Heal Name" <t>
/ac "Heal Name" <tt>
/ac "Heal Name" <f>