I am planning 5th to 8th December and will be staying in madikeriWhat are the places you are planning to cover in Coorg? Where are you planning to stay and spend time. If you share me the exact place, I can suggest a better route.
Remember it is still raining in Coorg and I am skeptical about Road conditions.
For Pune to Madikeri: Pune to Madikeri
From Davangere to Madikeri it is 2 lane and do not expect to pick up good speeds.