what temp is the secondary at? if it's in the 80's or higher it's possible you are getting a lactobacillus infection...which makes cidery mouth puckering sour flavors. It happens fast and creates a thin white pelliclie. How good did you scrub your secondary carboy and racking tools?
Primary - citra apa, citra saison with pineapple
Secondary - 9 Months in Flanders Red Ale
Bottled - Needlemead (Aug '14) Flanders Red (Aug '13), Beersel Brett Beir De Garde
Kegged -NE Abbey Beir De Garde, Kolsch, Sawtooth Nitro Clone