Winemaker Les Howard’s 18-plus months at Jamesport Vineyards have been some of the craziest of his winemaking career. There was the stressful-but-successful 2005 harvest season that may prove to be one of Long Island’s finest. There’s how he’s developing his own style as head winemaker while maintaing the quality Jamesport is known for. And recently, he’s been able to enjoy impressive scores from Robert Parker’s Wine Advocate. "Things cannot be much better here at Jamesport," he wrote recently in an email. Howard, a Long Island native, "never thought of being a winemaker" when he first started at Pindar Vineyards over…