I am working out the chords to a ballad in C.

At one point I have a bar starting out with a D chord which changes to an F in the next bar. There is a passing note in the bass on the 4th beat of the D chord bar, the passing note is E.

I have a D chord above the passing note, but it doesn't sound quite right. I believe there is a passing chord above the E bass that would sound better, but I can't find it.

The section looks like this:

Am............Am/E..D..........D/E..F..........G............

The bass is exactly what I want. I need a better chord above it to get from the D chord to the F chord.