I've been doing a lot of testing on Cleanse from the Alliance war support line lately. Getting Major Mending buff to proc off the heavy attack from the resto line is a little tricky / clunky to say the least. I was only able to get it to actually show the buff when I equipped Jorvulds which added 40% increase to uptime of buff (1.2 seconds). Maybe of course its all just lag and such but I am thinking the resto passive that gives 3 second buff to major mending should be increased to 5 seconds. The max you would be able to get than would be 7 seconds with Jorvolds. A heavy attack seems to take longer to complete these days and I know this passive has not been adjusted since launch. It might be a good idea to buff this passive at this point.