Hey guys , I dont know if this been posted , old post but here it is.
1.have glyph of slow fall(need no feather) or many feathers
2.go to temple of storms in The Storm Peaks
3.Jump of in direction you want , you shouldnt be able to get stuck on mountain because Temple of Storm is the highest spot in Storm Peak.
4.Use slowfall everytime its running out ... to go faster down right click so it fade away , and when you want again to go slow just use it again
I know its not faster than 280% Flying , but its faster than fly master because taxi's go to so many places , I figured this out when i saw my RL friend doing this he reached all the way to grizzly hills
Hope it can help you :wave: