Yeah, don't hesitate to use asylum as an additionnal HoT. It can be used after party wide damage fi you want, but's less effective that way. It shines a bit more in some specific raid situations.
Cure 2 is strong when the tank is loosing HP really fast, but try using some cure 1 if you can. There's a chance to get a free cure 2 proc by using cure 1, wich make your MP easier to manage.
I wouldn't go as far as to call it an error, but not over using it is generally a good idea. I can make the tank hold longer, especially if the pull tend to get a bit too long.