For sha hc, go for around 9k-10k (sha is pretty hard on mana) spirit then stack mastery / int ofc. Sha p1 is pretty reliant on tank / individual burst healing due to damage being avoidable, so in my opinion I would not advise taking Soul of the forest over incarnation, so stick with that. In terms of natures vigils strength, no it wont keep the raid alive like a tranq would but you can still stagger the 3 cds because of the reduced amount of throughput required to heal people up (mana saving cd).
Some weakaura strings you may or may not find useful
Lifebloom remaining time:
Code:
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Harmony (Mastery) Remaining time:
Code:
d0ZkdaGEiq7IQW2ub2hLKMjvrZLQYSL03Gi3KsQdl0THQXrj2Pe2lz3OSFvPYpPQ6VQQFl15PknukjgSQumCu1bvLKtJ4yqQZrL0cvrTuvqTybwospuvIEkyzQipxPjcbnvk1KPIPR41uPCvvPQNbbCDvAJQqBLkXMHY2vLsNuI(oeY0e08uLuJKkvFgvgnKy8QGCjvjCliQRbjDpiuxw0JPyyQIfAzlGiOKnjflAsFLMMT(klC5BnznF3tAW)ywdQ9UnUGvaApc9ajpSiaxGJahzlWRFmSnhDezKSG(Xv0pNEoDWPdEcDvyihgkyOeoUKkBb7enU9jmSwWorJBcOjUaufWr7lVP2SubcAeX8ZQE1zbSiE(jmSwq8sJcUmYiGJ2xEb3nFzFzJolGJ2x(VPVSrGaZDNg)JcXjfme80rahTV8FtFzJF(KgNMkWQcm9LncqabM(Yg)8jnonvaIrSaAI7NpPXPPcETawepxzRc0c8KGLb1UX1OrapT5O5UwHMgYsAMkEeG1SrWRmgItYMy9DVXk0CjojZ4vakjHdLrfO(iO2rhzl4U53uJ7QZcODnLTa8BDiYwJgb3n)lFA0zbMACxzlyjmUAkaHh(9LiuJG7MFtJhehDwWYNgzlyjmUAQIqnAeG1SbiiyQItHcCilFn6fMOXTvWl4fqtosZS9YNciMMj4q(XW2C0rKp4XIRNcrfj0wcrYILqlcd5WqbX70kqaXrGNeSmO2nUaerCguubQpcyxCBkHJlPRkqli64qgsZI1)qjCCjDLTgboKLVg9wAAMGs2KuSOj9vAA26RSWLV1K18DpPb)JznO2724AeeLTapjyzqTBCbLSjPyrt6R00S1xzHlFRjR57Esd(hZAqT3TX1i4TQaD4ZJgja
hope it helps