Extra inch under vacuum, is this normal?

Hi, I’m new to pumping and have a question. My length is 6inch erect but when I pump at vacuum 5 it grows to 7inch Is this normal and does it mean I have room for growth?

I have found that when I pump my dick in the cylinder, it increases the length, especially NBPEL. This is because the vacuum forces the base into the fat pad and also pulls out some of the inner penis. However, when I release the vacuum and exit the cylinder, my length measurements return to my pre pumped measurements.

Yes it’s normal and what I seek and it’s proven to give me BPEL gains.