I read your question a second time & may have misunderstood. If your asking if you can go smaller than 6.5, ie. with a boom length less than 200 cm, then the answer is yes you can go to 182 cm. If anything, the boom will be most stiff at this point. There may be some added swing weight in manouvers (compared to a smaller boom), but probably of little signifance for a novice.
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