filter woes
the fine mesh filter ports are quite narrow, i agree.
So I took a drill bit and enlarged the filter entrance hole by about, .100 thousandths diameter. That should help a little, and allow more water to flush through. On the drain side of the filter (that little rubber tube) there's a coarse screen in there, that MIGHT get clogged too, preventing the fine mesh filter to drain.
If increasing your water heater helped...i wonder if the dishwasher itself is not heating its own water...maybe there's an issue with that fantastic, gigantic Calrod.
Also, you could try switching to Cascade ActionPacs instead of regular powder.
the detergent cups in these machines are kind of in a stupid place because dishes CAN block them, and the way they open actually seems to prevent water circulation from reaching them.
I made my parents switch to Cascade pacs, and that solved all detergent issues, because the pac just falls out of the cup, even if it opens part way.
ALSO...there could be an issue with pump pressure. Is it possible that your molded wash arms maybe have a split seam? The water may be spraying out the seams...just a thought.
Best of luck!