I say, sell the aerobars and don't try to change anything! Your Giant Escape will almost always be more dependent upon your own muscle power, than any upgrade or accessory you could ever install.
If you want your bike to be lighter, then you should personally lose some weight and just make your travel package lighter.
Therefore, lift weights, do calisthenics, and cycle more often! This will make you stronger, while you'll lose more weight.
1 Stronger cyclist + 1 Lighter cyclist = 1 Faster cyclist