Maybe nothing to do with your problem but.....
I've got Campag' ergopower levers on my Wilier and if i shift too quickly from the big ring to the little ring,
it misses the small ring completely and drops on the bottom bracket, i now shift slowly and it drops on the small ring everytime.
Also had the chain drop completely off the small ring when i've had the rear mech/chain on the second big gear cog and on the big ring,
then changing down from the big to little ring it misses and drops off, changing slowly with ergopower levers is a must for me.
On many modern bikes these days and the vast amount of gears they have the chain deflection
is massive to the point a little clamp on device has been made which is called a 'chain watcher'
https://www.google.co.uk/search?num=10& ... LVyhUdbBIo
I hate RED DWARF