Dialling in the printing quality

Finally managed to get good first layer quality, without the print lines and also reducing elephant's foot. The two gears not the left was my previous setting, first layer height at 90%, and the two on the right are with the new settings at 50%. First time I printed at 0.1mm height at 90 mm/sec. I think quality could be improved with slower print speeds at some more adjustment on the first layer to reduce the elephant's foot. 

For reference the gear on the far right is nominal 22mm in diameter. I am contemplating printing a retrograde clock for my work desk.