If you have a look at what's really going on with macroblocking, you will see there are ways to mitigate it without sacrificing the overall picture.
Get yourself ted's pattern disc and look at the advanced brightness flashing bars, you will see that below 3% tracking and progressiveness are bad, and that for some colors you will see for instance that 1% is brighter than 1.5%, and that will exacerbate the macroblocking.
5% luminance control will have limited action below 3%, so don't use it that way.
But what you can do, is set luminance to -2 at 5/10/15%, and this will flatten the curve downwards and gain better progressiveness near black.
Then you raise brightness to the highest point before black glow (which should be done anyway).
Yes this will slightly darken the picture, but you will track far better near black.
Give it a shot.