I do not agree with you on the cooling. A large opening up front means nothing, if the cooling air cannot exit well, and the airflow is not forced through the engine cooling fins.
In landing, temperatures drop so quickly, that decent in flight conditions cannot be judged anymore.

On the oil:
MVVS prescribes fully synthetic two stroke racing oil.
The Comma semisynthetic is quite a cheap oil for scooters, and also is quite thin, see
http://www.commaoil.com/MSDS/English...0synthetic.pdf
It has only 35 cStokes at 40 degrees, which is very thin. The MVVS oil has 90cSt at 40 degrees! The oils I tested all had 60 or more.