I never wear the liners, I pack those for lounging afterwards and drinking. I always have been fine wearing them with just a pair of Under Armor Cold Gear 2.0 (their medium weight gear) and keeping the vents zipped. I've done this in weather as cold as -15F on the "peaks" of Sunday River and Killington.
I wore them last year in Stowe in March when it was like a freakish 80F+ and I died. Actually, I was wearing the LTD 686 destructed denim but same deal. Way too much pant for that weather. If you were good @ 70degF, you'll be good in all conditions.