Join Date: Jun 2009
Location: The mid-Pacific.
It isn't the weight of the fly which causes collisions during a snap-t cast. Once you initiate the lift you must maintain tension clear through to the snap. This way the fly travels above rod tip and is perfectly clear of the rod path.
The slightest hesitation during the lift and the line will bow under gravity pulling the fly into the same low trajectory that the rod tip will be on during the snap movement. THAT you don't want to do.