Year ago, I did this quest several times on live with multiple characters. I can tell you for a fact that
the Excellent Siren Scales were NOT THIS RARE.
First of all, I am pretty sure that they dropped from any Siren, not just the Siren Enticer.
Second of all, it didn't take me 6 hours to find 1 scale. They were uncommon, but not like this. I've already gone 36% into my level killing Siren's, and just 1 scale so far. This did not happen on EQ Live, I guarantee.
Look at the comments on Allakazam
http://everquest.allakhazam.com/db/item.html?item=5473
Camped the four sirens by the SS zone in for eight hours solo with my chanter. Two hairs and eleven scales dropped.
i saw 7 in under 1 hour was looking for hairs killed 18 sirens got my hair on last 2 mobs
Got 3 in one hour hunting for Siren Hair. Not rare.
On Project 1999, the Excellent Siren Scales are rarer than the Siren Hair. That's definitely not right.