[1.2.383] Piercing Changes

Code:

1: 552.1%/s
2: 662.5%/s
3: 795.0%/s
4: 954.0%/s
5: 1144.8%/s
6: 1373.8%/s
5482.1%/s

Tapped Pierce seems pretty good, but I wouldn't say it's too strong. I don't understand where you came to that conclusion. It's nice that it has utility so that it's not absolute garbage when you don't charge it. Uncharged Pierce does 10% of the listed damage, but since it has such a short attack time, there are advantages to using it uncharged. Previously, there were none since it did less DPS than Iron Arrow.
For reference, Iron Arrow is 3422.9%/s on mobs of six, or 570.5%/s per mob when you consider critical. It used to be 2931.7%/s before this patch, and only the DPS on the first monster was better than current version.
Blizzard is 5300%/s, but you have to remember that a lot of Pierce's damage is backloaded, so much like how Iron Arrow does more DPS than level 1 Blizzard on Big Bang/Chaos, you can get better training efficiency out of Blizzard because it takes the same number of hits to kill all the monsters.