Well if I understand you right and each week of the last month you rode that listed schedule as was mentioned you probably didn't taper off enough.I am not one for planning detailed schedules but the last several weeks(particularly the last) is not a good time to be pushing the miles and the day or two before the event you want to totally rest focussing on nutrition.As to weights most do not hit them hard twice a week particularly if also cycling.If hitting legs twice a week you could do one heavy and another light well spaced for recovery but I wouldn't even do this if I was cycling much.Also is the event 150 miles continuous or over two days?