Should I install my split AC outdoor unit further away so it's in the shade?
Most of the splits I have installed are pre charged for approx 15’ of line set. I looked on line and did not see much in the way of assistance.
 1kg is a small charge  I would be expecting closer to 2 kg based on the systems I have installed. I usually suggest the easiest location for maintenance is there already a receptacle mounted in either location this could save some $ as a receptacle is required by the national electric code. If you plan on issuing your system for heat in the winter the location really will not matter a large amount because any location effect gained in summer may be lost in winter.