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1. I've never personally worked on that type filter, but some of the points you make sound like you have dirty, or improperly cleaned, filter membranes. The membrane cloth can become obstructed, and one symptom will be patchy DE adherence. I've been told by Hayward techs that this can be caused by acid washing BEFORE using a detergent to remove oils. Reportedly, this may chemically change the grease and make it adhere semi-permanently to the membrane. Honestly, I've never run tests to verify that that's actually true, but I have seen filter membrane deterioration.
2. Also, if you go to the new Super Search page (http://pool9.net/ssearch/), and search for "Titan DE filter" both here (PoolForum) and at TroubleFreePool, you may find a thread where someone has had a similar problem in the past.
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