"Bf109G-10 has 9 min wep vs 5 min - that means if even Pony is running - his engine will overheat much faster and then 109 will close on it without problems "
In AH yes.
"Bf109G-10 has better turn ratio at mid-low speeds "
IMHO, not so. At least I keep turning with the 109G10 in a P51, and in the reverse situation getting outturned by 51's....