One part. Modify is the root word. Then comes modifier, change y to an i and add ending. Easier way is to put mod:

Next part, your healer is healing him/herself. You can use target=player for that, that way the macro works no matter what he chars name is and which healing char you use it on.

Next for me, I don't like to target anybody, ever. I let the mobs do the targeting. I just heal whoever has aggro. I use:
/cast [target=focus-target-target] HealSpell
It heals the person that the mob that my main has targeted (focus____main, focus-target____mob, focus-target-target____person the mob that main is targeting is targeting).

Last, I would be careful with keybindings. CTRL # and CTRL F# are prebound by WOW. Likewise, ALT is bound usually to cast a spell on your own char. Yeah, it usually gets broken in macros, but still. If things don't work, try SHIFT or CTRL or ALT as substitues for each other and if it works, then check keybindings.

Hope that helps, good luck.