BARD resource?

[Ooshima]

You must be doing it wrong, it's impossible to not find any diference because your attacks will come out first. Using the macro is like having a longer global cooldown.

So you must be always right? Seriously I have been using manual all the while until recently I tagged BL to Heavy Shot for convenience and nope, there isn't a difference.

There might be a difference if you are tagging more than that, such as Heavy Shot-BL-Straighter Shot together but if it is just Heavy Shot (GCD) and BL (OGCD) together, it won't make a difference because whichever is available first will fire off first, such as BL will fire off first if Heavy Shot is still on CD.