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Can you try http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=152894736
I too did complete your test with only 2 cubes. You can solve this problem by connection all the relays to the exit, so it opens when your puzzle is complete.
Would you mind trying one of mine?
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=151507310
I recorded my gameplay (valve DEM file format): Download [dl.dropboxusercontent.com]. Comments inside video.
Turrets highly explosive. Handle with care
To do it with two cubes, you just have to make a portal on the floor near where you get the 3rd cube, another portal next to the lift at the door, jump into the portal and bam. You end up at the door.
==========
Support me by playing my Custom maps in
Would you mind trying one of mine?
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=148919557
Feel free to try some maps in my workshop if you have a moment ;)