I had the same type of outcome on one batch. I have used it twice.
The first time was on a BDSA, and I left it in the 2ndary for a couple months before bottling. This batch doesn't have any of that bready/yeasty aroma and is developing more and more of the dark fruit flavors I was hoping for as it has aged.
Then I pitched a Dubbel on part of the yeast cake from that batch. This one came out tasting great. I left it in primary for maybe 3 weeks or so (don't have my notes with me atm). But as I have gone through the batch, that yeasty aroma has increased.
I figured I had just over-pitched by pitching on the yeast cake, even though I had dumped out a good bunch of it. Maybe it just needed more time. I'm not sure.
On deck - a few single hopped pale ales - Cascade, Calypso, and Legacy
Primary/Secondary - a sour mashed Berliner Weisse; Chris' Tall Ale (a Belgian golden ale); Cascade Pale Ale; Northern Brewer's Oud Bruin de Table / nada
Bottled - Imperial India Pilsner Ale; Little Gyle Palesner; Guajillo Ancho Brown Ale; Back To School Porter, an Imperial Robust Porter with vanilla beans added