Fly straight to the close construct platform, clear whichever drakes agro, then fly to the center. Clear the center, fly from the opposite side of the center platform to the next construct platform, clear it and then head back to the center and fly through that to the boss. Kill the one or two drakes in front of the platform, and if you see one of the drake fly over the center, kill it. Total number of Drakes killed shouldn't be over 5, maybe 6.
After that just bounce up to the top clear the next guy and all the whelps, pull the Ley-Guardian and you'll finish with an easy 5 minutes on the timer.