A tip that I found works starting the 2160i when hot.
Before Start
Mix - Full Rich
TTL - Full Open
Wait about 5 - 10secs. You sometimes hear the fuel pressure in the pipes released.
Mix - ICO
TTL - Half open
Now start. Once the engine catches release the key
Mix - Full Rich
TTL - Idle - you have to be quite quick with this or the engine roars away a little.
Give the engine up to 30 secs to start - it can sometimes take a little while. If you abandon the start or it doesnt work make sure you release the pressure again as above first.
It has never failed for me in 800 hours on type.
As for starting at 3000 feet. No problem, the windmilling combined with a quick turn of the key works a treat.