Thanks for spending your valuable time to check my plans and help us. !!The Day 2 and Day3 parts look really hectic. Delhi - Jammu can take anywhere around 10hrs and above even on 4 wheels. And given that most of it will be night riding it will take more than 10 hrs fro sure. With that the next day from Jammu - Srinagar will also be tiresome.
Would suggest to take the train upto Jammu and start from there.
For the return part you can take a train from Chdgrh/Delhi.
My initial plan was train upto Jammu- Which is travel time is 55 hours. And as per my plan, 3rd day eve only. I will be in jammu.
So that we choosed Delhi (28 hours), Where we will reach by 2nd morning and by night, We will reach jammu via roadways.