I see what you're saying @
pULSe. I was thinking if we did a different form of poetry it'd be more difficult and challenging to write in different ways. Plus, if you can do it any form you wanted, some person might rhyme and someone might not. Then voters wouldn't realize what was going on and be like: "This guy didn't even rhyme?" I see there being too many problems with the rules being very exact and explained to the competitors.
And I agree with set topics. I think it should be a set topic and set form of poetry each round. The topic would be different in each battle, but the form would be the same for the whole round. The form would switch each round, though.