Why are yeh not doing something like this

/stopmacro
/cast [target=hardcodedTankNameHere] Regrowth

actually even better if yer off dpsing with yer healer

/stopmacro [harm]
/target hardcodedTankNameHere
/cast Regrowth

Just set one key aside as yer heal key.

The only reason to use the ftl thing is if yeh want to heal who ever yeh switch to
something along the lines of

[nomod target=group1]
[mod:ctrl,mod:shift,nomod:alt target=group2]
[mod:ctrl,mod:alt,nomod:shift target=group3]
[mod:alt,mod:shift,nomod:ctrltarget=group 4]
[mod:ctrl,mod:alt,mod:shift target=group5]
/cast Regrowth

syntax may be incorrect at work so I cant check :P