Disable and enable the keys that you use for Assist and DPS in two steps (Step 1 disable, Step 2 enable) so that when you're mousing over the area; the healer doesn't try to assist or do dps and interrupts his/her heals.
Unfortunately I don't have my XML file available anymore and my SWTOR subscriptions have been cancelled.
But if you can try to explain where/when you get lost or have issues; I will do my best to help you out.
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