I had no problems on hills going from a triple to a compact. But I don't think I had a 34 on the back!!
However, it did take me a while to learn the ins-and-outs of shifting for maximum benefit as I got to the hills. Since the gearing is different, your usual combinations won't work, and you have to re-learn where your own "sweet spot" is.
If you absolutely can't handle it or get accustomed to it on the lighter Madone, your best option is probably to focus on the cassette, rather than the crank. It's possible your rear derailleur cannot handle a 34 cassette. Rather then changing out the crank, it might be cheaper and bettter to change out the rear derailleur and put a bigger cassette on it.
Your LBS should be able to guide you.