The bump handle attaches to a rod that goes through the plates that hold the fingers in place and it uses e-clips on each side of the plates to move the finger/plate assemply. No pressure against the bump handle could be that you are just missing an e-clip or 2 and the rod is moving freely through the assembly.
My recommendation is to take the filter apart and compare what you have against a schematic like this one: http://www.hydropool.com/cgi-bin/hyd...db/ml=100.html
Inspect all of the internal parts for integrity and see if anything jumps out at you as just not being right. If all looks good, try cleaning out the old DE and replacing it. I have not heard of bad DE before, but you may want to try getting a new bag of it and see if that helps with the coating problem.
Since your filter is holding the DE and not blowing it back into the pool (diaphragm gasket appears to be intact), I am at a loss as to how the water could go around the fingers instead of through them.
I hope this helps a little at least.
Regards,
Mark
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