Sometimes another option is to repeat the /ac multiple times. That way if the /ac fails it tries it again and again. It won't prevent it from failing but may reduce the amount it fails.

/merror off
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <t>
/ac Physick <t>
/ac Physick <t>
/ac Physick <t>
/ac Physick <me>
/ac Physick <me>
/ac Physick <me>
/ac Physick <me>
/micon Physick

You can also make it more likely to do the one you want.

/merror off
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <mo>
/ac Physick <t>
/ac Physick <me>
/micon Physick