These are the mods I have done so far.
Before any mods the hydraulic temp on a 24c day was 85c at its peak after about 2.5 hours.
Today was 27c, and after 6 hours, it didn't get past 58c.
The hydraulic radiator is the 13gpm version from Princess Auto.
Aux lines on boom are 8l din.
Return line to tank is a 15l din.