Milking and hanging

I started PE about 8 months ago, I only Jelqed for a couple of months and then changed to hanging, I’ve gained 2cm.

I’ve noticed that just before ejaculation my member is about 1cm longer than when I get a normal hard-on.

My Question: Is this normal?
Will it improve with better conditioning?
How do I improve my conditioning?

I now started Jelqing and hanging in my routine and not only replace the one exercise with the other.

Any comments/suggestions are welcome. Experienced PE only please