Naruto didn't have any chakra cloak around him when he used a small portion of Kurama's power, the initial form
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. When Naruto gain great amount of Chakra is when he got the cloak, example is when Kurama first gave Kakashi chakra, he didn't don a chakra cloak.
Naruto does it on a higher caliber because he has more chakra to do it with while Tsunade and Sakura have a limited amount that they need to reserve to heal future injuries but that doesn't mean Naruto is limited to only using the chakra transfer jutsu alone when Kurama compared Naruto's method to a Bijuu less Minato's.
Sakura, like other medics, speeds up a person's natural healing process by sending their chakra to the wounded area. They have to match the chakra to the affliction or injury (not to the person's chakra), it takes advance chakra control because if they put too much chakra into a person's system then they can overload a person's natural circulation and place them in a comatose state as Kabuto did to Kiba in part 1.
Precise chakra control is just one type of chakra control, there are many more different types as well as different types of chakra control training for it. Walking on trees was said to be difficult chakra control for some skilled ninjas because trying to build the chakra up while moving in battle can be difficult
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and
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. Walking on water chakra control is more difficult because you have to expel the exact proper amount of chakra from your feet to the moving surface of the water
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.
There are also Shape manipulation and nature transformation as I mentioned before. Naruto learned these four chakra control and even combined them all together. Combining the tree/water chakra control was first step in learning Rasengan which also used shape manipulation to condense it into a spiral ball
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and
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. Then added Nature transformation to it for FRS. Jiraiya and Kakashi both said the chakra control for Rasengan was high
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,
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, and
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