yes 3 is the hottest
You need to drive it a bit more incase it is just fluids in the exhaust. If not i would say its fuct
Check that residue out and determine if it is definately water or oil. If it doesnt clear and you say the turbo is fine then that head is going to have to come back off.
180 degrees out
You should fit a 13 row oil cooler if you want to use it on the track, Also foam fill the fuel tank or never let it go below 1/4 of a tank