There are so many easy light ways to crack this nut that I think you highballed the weights. You should have started at about 1/2 pound for the weight and gone up in 1/2 pound incriments.

lets see...

rain mittens - 1.2 ounces
rain jacket - 7.9 ounces
rain pants - 5.3 ounces
GoreTex Socks - 3.5 ounces
Total = 17.9
Staying dry is half the battle to staying warm. Your rain clothes are an extra layer you always carry anyway.

Then the insulation:
extra sock liners - 1.1 ounces
glove liners - 0.9 ounces
knit hat - 2.1 ounces
fleece top - 9.4
fleece bottom - 8.2
Total = 21.7
This works under the rain gear in cool weather like you are describing. But depending on the situation I may not even bring this much since most of the day I will not need insulation and at night the sleeping bag does most of the work.

So total weight for this stuff is 39.6 ounces, or 2.5 pounds. I would probably carry an extra pair of socks, underwear, and a t-shirt for less than 1/2 pound if I was going to be out in wet conditions.