I've been running in New Balance 1400s since the beginning of 2015 (in regular running I alternate with - yep - basic Skechers Go Runs) for marathons and every other distance as well as half of my regular runs. I've run about 20 marathons wearing the 1400s and am at a loss. Everything looks marshmallowy and squishy, and it's just not my bag. I'm a 59 y.o. woman, 5'3", 118 lbs. I need some real shoes for marathon distance, not smushy shoes. Please advise and thanks.