So most have probably noticed that things are dying A LOT quicker in-game than they did before 11.5 launched. CPT Ganos and I ran a GGA and it wasn't even fair. GGE would probably have been easier than GGA pre-patch. People are also reporting significant jumps in their DPS, with some reporting as high as 80K (which is absolutely ridiculous). as expected, there are a number of "exploits" and broken mechanic, and TONS of lag.
Based on unofficial chatter, expect either a huge nerf across the board, a buff to NPCs, or both.
TL;DR - Do not expect your current performance to last.