your estimated OG is way off. 14lbs LME is an OG of 1.101, unless you have some weird kind that doesnt have a ppg around 36. 11.5lbs LME would give you an OG around 1.082 if thats what you want.
definitely ditch the amber lme for light lme and 0.5-1lb of crystal. amber extract uses C60, but you can choose whatever tastes best to you or mix it up. whatever way you go, id consider adding half the extract at the end of the boil. it reduces caramelization, keeps the brew lighter, ups hops utilization, and supposedly reduce the 'twang' thats sometimes associated with extract recipes
as for the hops, how big is your boil? 2oz of nugget could put you into IPA territory for IBUs depending on the size. regardless, I'd do half the cascade at flameout or dry hopped to get some aroma in this