All good advice! One thing that has helped me throwing clouser patterns is to use an oval cast to insure there is no abrupt start and stop. That is, a standard forward/backward cast will result in an abrupt stop and start that willl send shock waves thru the flyline.
If a low back cast with an upward oval forward is initiated, there is no abrupt stop and speedup. This results in a seamless backcast and forward cast. It is my preferred method with a sinktip and clouser patterns. Throw in a double haul with this method, and the whole line flies. Don't forget to tuck the rod with the thumb at the end of the forward cast for good tunrover. If you don't, the line will dump in a pile.