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Indeed, John is correct. More information lurks within the data set that you present Darren. One way of working out how far you can stretch or push the data is via careful analysis of the histogram. Ideally, when you see the data begin to comb (vertical lines through the histogram), you know you're close to its limit. Some combing can be dealt with, in fact if you run a noise reduction algorithm while the histogram is combed, it will clean it up - pretty cool. But don't push your luck. Better back off the stretching instead of dealing with the consequences of hard pushed data. This can only be used as a general guide as there are other constraints that may also reduce how far the data can be pushed.
Below is what I mean by combing;
First attachment shows no combing.
Second attachment shows the effect.
Quality data can be stretched further than weak, hence its worth acquiring more data where possible. Be careful you don't clip the highlights as you stretch. By the looks of the data, I'd say you effort in going long with subs etc has paid off. Details are quite pronounced. Keep at it!
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