Tested again and all my NX files are the same at 40.1. Then checked Rawker preferences and changed to 'always use DCRaw' and the file size increased to 41.9. This must be what you are using and it gives a very different result with lower contrast, detail closer to LR and rather inaccurate colours (I think). Certainly think Rawker has potential in reducing high iso noise with NX files anyway - just a shame I never use anything over 400 as a rule.