I think really the best way is to listen to yourself and pick the little things out and work on them,as your i suppose your own worst enemy as a critic but
from a production point of view thats what id expect.
do you think your sloppy?everybody i nkow on all instruments think a lot less of their capabilities which obviously isn't a bad thing cos it's only gonna improve your playing i suppose but maybe there is a point where you could over anylise it too much,not that im suggesting you are.
i try to record an hours jam now and again with out turnatablist and rhodes player and listen to it back really carefully because i want to know where i should be doing things better.
if that helped, which i doubt..... thats just my odd way of doing things.