Originally Posted by
Dirtdrop
Sluggo gave you the best advice. You don't need a new derailer or a longer chain. You need to stop cross chaining.
So the large/large and small/small are cross chaining with a double as well? I was familiar with the term only regarding a triple front crank. I am running a shorter bottom bracket spindle than the one that came with the triple. 112mm vs 126mm(?) I think.