NORTH ANDOVER – Spring ball season is officially winding down over these next two weeks and Merrimack is putting final touches on a very productive couple of months. After finishing 5-6 a year ago (2-5 NEC, good for 6th place) there is reason for optimism in North Andover. Head coach Dan Curran has continued to establish a gritty culture at Merrimack while also producing some NFL-caliber talent. There should be…