Wall Street's biggest banks just delivered some of their strongest trading quarters ever, yet investors remain hesitant, leaving bank stocks struggling to gain traction despite headline-beating results.Goldman Smashes Trading RecordsGoldman Sachs Group Inc. (NYSE:GS) blew past expectations for equities trading revenue, setting an all-time Wall Street record.The bank reported $4.31 billion in equities trading revenue for the final quarter of last year. That marked the highest such figure ever posted by any b ...