Karin only used them this chapter because she has unlocked them this chapter. Before this chapter, she never had this power up. This is just like the fools who were saying that Sakura's Yin seal was just a one time thing and that Sakura's strength was used up for another three whole years before she
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.
As for Juugo, I'm not too sure if they can handle his raw power, speed and durability. These laser canons fodderize Kidomaru's webs or at least repel them away. (
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)(
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) I know the cannons have a charge time but considering Juugo tanked a
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, I'm sure he can last long enough to use it.