Once you get a portion of the G26 to print OK... The process is simple. Move the nozzle to areas that are bad, and edit them. Don't try to get it perfect the first time. Just get it better. Look at the area and ask yourself "Is the nozzle too high or too low in that area? And then adjust the worst part of the area by .1 mm. And adjust the better parts of the area by less than that amount." It won't take that long (or that many iterations) to get everything perfect.