Great start. I can tell you some tricks but I can't offer a reason unfortunately.
Take some short exposures so you don't blow out the trap region.
Put the blown out version and the non blown out photos I photo shop layers and use the rubber tool to merge the two so you retain the trap and the nebulous putter regions.
Also run the dodge tool around the nebulosity and see if you can get a little more..it's there I bet.
Alex
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