Hi Ramnath,
Good to see you have had some improvement.
Is there only the 2 ceramic capacitors shown on the schematic and can you share the part number for them? This reference design uses an LC filter and many capacitors 100V X7R capacitors on the input. The layout also has very good bypass near the high-side and low-side FETs to minimize the input current loop. This was one thing which could be improved on your layout.
By the way I also recommend reducing the file size of the oscilloscope screenshots so you can upload them directly to the forum. The internal TI firewall blocks mediafire and I had to wait until I was on my personal computer to view them.
Best Regards,
Anthony