I managed to achieve some slightly better results by customising the colour gradients. I noticed that the default palette had very little difference in colours below about 10mm. I've chosen very contrasting colours that look garish but show more detail. Here is the custom setting if anyone wants to use it.
[[0,[111,111,111,255]],
[1,[166,176,199,255]],
[2,[83,136,222,255]],
[3,[101,150,62,255]],
[6,[242,205,81,255]],
[8,[232,138,90,255]],
[10,[214,92,92,255]],
[15,[161,77,77,255]],
[20,[232,232,232,255]],
[40,[162,117,204,255]]]





