Awesome Awesome job!!!!!!!!!!!! I wholeheartedly agree with your "get it working and then optimize" approach! Awesome work! I definitely think that smaller caps will give you cooler temps. I suggest something from this family:
http://www.panasonic.com/industrial/..._ed_ts_dne.pdf
Also, too high of a ripple current causes heating in the caps, but you can add significant ripple current per capacitor with these little buggers, and people use them to protect against voltage spikes. Fran on the EV Tech list is adding them to his design for a controller that he's going to push to it's voltage and current limits. Just put them in parallel with the electrolytics. I haven't tried them, but I'm ordering some 250v ones:
Digi-Key - P12240-ND (Panasonic - ECG - ECW-F4225JL)
Your inductors are working nicely? I can't wait to see your parts list! I want to make one too!!!! Awesome job!