Nearly eighteen months on, the "solution" appears to be "melting the ice"?
The fix is not melting the ice as much as it is mitigating ice on the move, en masse. According to what I've heard, the FOHE design has been modified for reasons of flow, not heat transfer.
Reliable fuel delivery is something we should have mastered by now. Perhaps after the introduction of new fuel formulations, certification was not thorough enough on this particular aircraft and engine combination.