Upload - The impossible objective

Upload is by FAR the most difficult objective wave. To the point where it is stacked so heavily in the enemy's favour that it can be completely impossible to complete.

The other objectives are downright easy. They even made the second hardest objective, Devices, so fast to complete that you now hope it comes up in your match. Even the fact that bosses can now be Assassination targets has made it only slightly less of a cakewalk.

Upload on the other hand has multiple requirements. Firstly you have not one but three sites to handle, Secondly you must ensure no enemy has so much as a toe in the circle, Thirdly god forbid you should have to leave the circle for more than a few seconds because all your progress is then lost.

Some maps are so small that the upload sites can literally occur in a line right next to each other (Magma I'm looking at you) causing the enemies to swarm and make uploading at any of the sites absolutely impossible.

Cobras deal so little damage that trying to use them as a viable option to clear an upload site is laughable.

If you attempt to defend an upload site and get swamped then the more you fight the more swamped you become. But you can't leave and come back because this will render all the time you've been fighting utterly wasted.

Enemies of all factions come into close range so often that the rate you have to kill to clear the circle is insane. And enemies move so fast across the map that even when attempting to lure them from an upload site you will return to find they are already on your tail. Luring enemies used to be a viable option in ME3MP.

My suggestion would be they move the fact that enemy presence pauses the progress from Upload to Hack to make the one easier and the other harder.

Thoughts on the balance of different objectives? Any viable strategies? Has anyone ever managed upload on wave 6 Gold/Kett/Magma?? If so I salute you.