I haven't played for a few weeks...

But the crusader aura macro was working then.

/cast [mounted] !Crusader Aura
/cast [nomounted] !Another Aura



Heart Strike is a Blood Rune.
If your macro is sticking on that ability consistently, you're using too many Blood Runes in the rotation.
Possibly take one out.

Do you have too much runic power?
Do you have another rune available, but are trying to spend an unavailable Blood rune?