Now that I understand your set-up is not abrasive I edited my original answer.
Yes, the direction you have your hose wrapped hold moisture right against the tree with not chance to dry. You can use a hose as you did before, just set it up as in the pictures below.
Make sure you leave it loose enough that the tree is able to sway some in the wind. Those large PNW wind storm will snap your tree in half it is being held in place to hard. This also encourages the tree to make good anchor roots of it own.
Good anchor roots will develop in the first year. Which means you will be able to take you stakes down, in fall of 2020.
I went outside to take some pictures of a better set-up. This is a recent tree to our boulevard, planted by the City of Victoria's Parks Dept. They use a rubber hose from a outdoor faucet. It is soft, it will not damage the tree, but protect if from getting damaged.
The cage around the outside is to protect the tree from getting rubbed by deer antlers. They like to use trees about this size to rub the velvet from their antlers in Fall. As well as leave scent markings for does.
(The marks on the tree are natural. It's a Stewartia tree. As they age they get nice display of peeling bark.)