My trike and I are quite slow when hills enter the equation (slow going up, rediculous going down) I think that you probably want to make sure the seat is adjusted correctly to save your knees. I had knee problems the last time I did 65 miles, which seems like you dont have that problem.
I would recommend regular under-armor style long spandex pants. the padding pants always seem to get in the way on a trike, since you tend to not need it in that area. Feels more comfy to me, anyway.