If I’m already getting hits, would I notice any difference if I added Instant Shine? From what I’ve read on here, many of you are big fans of the IS + Ammo combo, but is there really that big of a difference from using just Ammo alone?
Try it and see - Its the only way to find out if it works for you. 
Personally, I’d suggest it won’t do any harm to try and it will broaden your phero experience considerably. IMO, IS improves response to a whole lot of pheros.
I don’t own IS yet, but everything I’ve read on it has been positive, especially when stacked with Ammo. I’m still new to all this and have become somewhat fascinated by the responses I’ve been getting from Ammo. I’m just curious how far it can be taken.
That’s the spirit! 
What hits you have been getting the first week? I came on this thread to read the hit report as the title indicates but this thread is for a question not for the hit report.
Sorry for the misleading title. I will dedicate the rest of my life trying to pay you back for the 10 seconds it took you to enter this thread and read the original post. My deepest apologies go out to you, good sir.