I want to know the answer to the following question:
What was difficult to get set right on the new guns?
All the background I'm provided with is that "With little experience in the role, no means of measuring target, range, height or speed the difficulty of observing their shell bursts relative to the target gunners proved unable to get their fuse setting correct and most rounds burst well below their targets.". Is that enough to answer the question?
Answer: yes