I have a Campy Chorus Triple that has shifted well with the older wider 10 speed Campy chain. Older cain not available.

Replaced the chain with the new 10 speed ultra narrow version resulting in shift problems. When I get it adjusted to just barely shift down to the small ring in front it will flop off to the inside almost every time. Never did this before. Chainline looks good. Fr der ht and angle are good.

Suggestions? What replacement chain is best?