I have a SRAM Force compact 50-34 and 11-28 setup and am experiencing occasional chain drop when shifting to the 34 ring. I try to stay in the middle of the cassette before shifting down, and also let up a bit on the pedaling pressure. And of course, it never happens on the work stand or riding on flat terrain. Was thinking of putting on a chainwatcher; however, the local LBS says when everything is properly adjusted, chain drop shouldn't happen.
Any thoughts as to type of chainwatcher or other suggestions are appreciated.