H1 B amendment and re-stamping

I have got a valid H1B till Oct 2014. Now due to my designation change my employer filed for my H1B amendment and its approved with new expiration date December 2015. I have already initiated my H1B restamping process with help of my employers immigration team and I’m eligible for “Interview waiver program” as well. However I don’t want to go for stamping as my vacation period is very short (just 1 week). Is it mandatory for me to go for restamping as my current visa stamping page in my passport shows its valid till Oct 2014? Will there be any issue in POE while I’m travelling back from India. I wil also carry my new approved I797 document as part of my H1B amendment confirmation. Will this help me to skip the restamping process atleast for this trip??