There are also high output baseboards that could be installed. However, you will most likely be fine with what you have as good installers often oversize the zones a bit to ensure there will be sufficient heat when the thermostat calls. An oversized zone just means it will run in shorter durations to heat the space. Running lower water temp it will have to run longer to accomplish the same thing. This is not a big deal and you can always upgrade or add baseboard and/or add a radiant zone as needed to extend the heating time from storage. It doesn't have to be done right off. I ran my tarm for a couple of seasons without storage at all. It just had to be filled 2-4 times per day depending on how cold it was and I used more wood. These systems can be installed in phases as time and money allow. Just plan for everything you want in your system design and add when you can.