I have been trying to get a hop aroma into my Fullers ESB recipe.
The first one I made (years ago) was great. I just threw a fist full of EKG on top of the brew in a beer sphere before sealing it. The aroma was perfect and immediately identifiable with ESB.

I have never been able to reproduce this aroma, despite doing what I think is exactly the same thing each time.

2 changes I've had make are:
1. Replaced the floating ball and tube that connect to the tap in the keg
2. The water in my area has changed a little. I have found it difficult to exactly pin the change down, but I think there is more chlorine in it.
I don't think these changes will impact the hop aroma. Any advice is welcome.