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It does look very clipped Mark. Initially the histogram should look like the first one below (this is for faint DSOs anyway. Bright nebula will look a bit different). The histogram should be way to the left as is yours, but there should be a gap between the 0 level of the histogram any your curve. But even after stretching and adjusting most galaxy histograms will still end up being fairly bunched to the left like the second image. The exceptions are for really bright large galaxies like M31 and LMC, eg third image. The third image has been dark clipped as you can see but the histogram spread much further than the first histogram.
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