Good assessment of the North Slide. Not an easy way down for sure. I hiked the Tripyramid Loop the day before you (Saturday) but I went up the North Slide and down the South Slide. I hiked Mt. Moriah Sunday and it was one of the best days I've had in the Whites... the weather was unbelievable! The views from Moriah are incredible! Here's a shot of the Presidential Range from Moriah.