Walter & Group:
Here is Bob Andreae's answer to the question of when one might consider changing trajectory. This is brief, to the point, and would be a good way of answering that question when asked it on an MCI exam. THEN you could easily expand upon it if your examiner asked you to do so.
Gordy
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wind direction
size of fly
distance of cast
accuracy
desired
presentation desired(gentle vs plop)
location of presentation
(under low branches)
(Bob Andreae)