I think starting November my hit rate dropped down to 2% and 3%, from about 7% or 8%. There have been instances were I unloaded a full 110 ammo load on a con and did not get nuf hits to kill it.
Now, my aim is not good - thats a fact - but I have also seen that its harder for me to hit from d200 when the con is twisting and turning (not stick stiring I think) than it is from d400 or d600.
My guess is lag has been worse lattely. Try not using zoom and don;t get too close.
Don't know if this is related but some times, I will keep getting hits after the con has overshot me for up to 3 seconds sometimes or I will get a pilot wound after the HOer has passed me and he is atlist d200 behind me.
Another example form e few days ago, I was shooting at 031 from d200 again. After using all my ammo, I asked him how far behind he was seing me. He said d400.
Something has changed with the game

(edit)
Just remembered. Has anyone noticed that when you have someone lined up, close, and you have the perfect shot, that the con moves as soon as you pull the triger? It looks like the guy is going right, you line up for a canopy shot, pull the triger and all of a suden the guy is going left, as if he was performing a barrel roll that you did not see? Only happens at close range.