Cheri, I'm having trouble figuring how your current wheels can be 4 lbs heavier. That's quite alot. I can't find any info on your hubs or rims - not parts for sale through the usual channels. Guess that's where Giant cut corners to keep the price down. Easily upgradable though. Using 20/24H paired spokes makes the wheels look light when they aren't. Just a marketing ploy. And if you ever break a spoke on a wheel like that, you can't possibly make it rideable enough to get home on. You're better off with a good quality rim (like Mavic) and 28-32 evenly spaced steel spokes with a 2 or 3 cross pattern. Maybe you can try out some different wheel in the next few months (just borrow wheels off friends) and compare the feel and weight of super-expensive and moderately-priced wheels (like Mavic Open Pro rims, Shimano 105 or Ultegra hubs).
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72