Thank you. Now it is getting very very cold here and Little bit less work so had time to do some playing around on the Internet and found some approximate data.
Internet is saying, it seems Average Gradient to Devaramane is not so much. around 10% and also not very Long (~3+KM) but there are some sections above 15%.
But what was interesting is the climb behind Hornadu. This is coming to average 15%gradient. I went downhill here :-). But someone can try the uphill.
It is approximately same Elevation gain as Nandi but in just 5KM as apposed to 7KM(??) Nandi climb. I have not gone up Nandi though.