Swing the Fly magazine - 2019 Volume 2 is now available. Check out my article in this issue called Making the Adjustment.
One of the keys to making consistent and effective Spey casts during a day on the water is to adjust your setup and casting stroke to changing conditions. Factors such as wading depth, current speed, wind, and casting obstructions all impact the cast. The article provides some thoughts on dealing with these factors.