After trying a few more times, I went and had a sugar ring doughnut. Its amazing what a sugar rush will get you
SPOILER INFO.
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I went up one tower (called Tornado) went to the centre tower, and went out each of the doors on the ring, noting each tower name and realised there were only 4. In clockwise order they are Tornado, Tsunami, Eruption and Landslide.
Knowing I was missing a tower, I went back down Tornado and ran around outside find the base of each tower and checking tower door names. I found Earthquake YIPPEE!
Entered Earthquake, killed the mobs, went up on the corpsesmasher, went up one circle of the ramp and came to a door, the ramp continued to go up but I didnt. I went out the door onto the walkway and came to the middle tower. Entering it I was on a different lvl, with another door. I exited that and it took me to Hurricane tower. Went up that one, out onto walkway and back into the central tower. Then just followed standard portal completion instructions.
I also found out that the Ascendant Call was just the equivalent of a lift button, it does bugger all if the lift (aka corpsecrusher) is already at the same lvl you are! hehe
Hope that helps anyone out there who was wondering.
Sheri