Could I progress to a shortboard?

Iv been surfing for a year now,and can stand up indefinately now.And i'm starting to manouvre a bit more than i used to be able to. At the moment i'm surfing on a 7,3". But I thought that maybe surfing on a smaller board it would be easier to manourve, and would make duck-diving under the waves a whole lot easier. Than trying to duck dive with my minimal which is not a good idea.
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Could I have some idea's please of what you thik I should do?
thanks

Could I have some idea's please of what you thik I should do?
thanks
