From your description the tubes are definitely not all the way in. I can see through the venting holes that the tube is not properly seated, I also felt that it only went in 1-2 mm. Here is a picture from the side
http://imgur.com/QhV2iol. Never used Imgur, so hopes this works.
The question is what do I do now? I don't want to try brute force. I've tried wiggling with no luck, maybe I did not try long enough? I could get some socket savers and see if they go in, was thinking of maybe getting some anyway. I'm afraid if I get the tubes in I will never get them out in one piece, it's just so tight. I guess lubing is out?
I have not tried to turn the unit on, don't want to damage anything.