Warmth for 60'ish F nights

[seakayaker]

Hello,

I have a Hennessy Explorer Asym, JacksRBetter Mt. Washington underquilt, down top quilt, and I also use a sleeping bag liner (supposedly adds another 5 F). This setup works fine easily down into the 30F range.

I'm planning a trip for May where I anticipate nighttime temperatures in the 60-65F range.

I'm trying to determine if the underquilt and/or top quilt are needed OR if instead I could sleep wearing capilene base layer and using the sleeping bag liner.

This would save a lot of bulk as well as weight. I can also say that I prefer it on the cooler side even when sleeping at home (we normally keep the nighttime thermostat setting at about 65F).

What say you?

Seakayaker