Time man, look at your pumping like you are going to the gym. You won't see any permanent gains in your biceps if you only worked them out, for the first time ever, just three times.
An important question first:
What size cylinder do you have? Is it narrow enough so that your cock touches the inner walls?
If so, then you will be able to pack that tube with your cock so that you are touching it all around inside the cylinder, at which point you will then be working mainly on length. However, that will take some time!
When you pump, the pressure is pulling your cock out and away from your body. This is stretching everything, every part of your penis and especially the roots and attachments to your body. Before you pump, try this. Find some flaccid stretching exercises and stretch your flaccid penis for a few minutes prior to pumping. That could help get more length gains started sooner than later. Also, get something hot (a hot wet rag, or a rice sock or some kind of heat pad thing) and as you stretch your cock, push the heat against the spot where your cock meets your body. For instance, if you are stretching and pulling your cock to the left, push the heat against the right side of the base of your penis. I find that when I do this I get really nice, relaxed-feeling stretches; like the stretch works better and everything feels looser. Just some random tips, hope these help!
Post some more details about your routine, too! More info means you can get more assistance and advice
