I have the 228, 229, 239.. and I used to have another 229 as well.
Every gun seems to wear a bit different. Some guns will develop lines running perpendicular to the length of the barrel on the exposed top of the barrel (the flat part) like yours. I wouldn't be too concerned about it. Based on your pics, I also wouldn't really describe them as "gouges", but to each their own. I think of a gouge as... you dropped it and it hit the sharp corner of something, something like that.
But yah, even within the same model, same calibre, they will show different wear patterns. I had two 229 9mms for awhile. I could tell the barrels apart by looking at them.
SIG barrels will show wear marks over time which are more noticable than a lot of their competitors (like GLOCK factory barrels, which show very little wear over time). Most of it is the finish wearing off, but in some places the metal will polish to a mirror finish. The difference is not barrel quality, it is because SIGs lock up pretty tight and many other guns have a lot greater "tolerances". I bet your gun is pretty accurate... correct? The slide and the barrel are just getting used to one another. The process can take a few thousand rounds.
I find that SIGs take a thousand rounds or so to break in. I find that the action will break in a bit, and so will the trigger. SIGs (other than the custom shop ones and X-FIVEs) seem to ship with "creepy" SA triggers these days. It doesn't last that long though. I was trying a bunch of different SIGs at Reliable the other day and they were all like that out of the box: 226 stainless elite, 229 Elite. They all have that touch of creep on the SA break point. Great guns, they just need some use.
I bought one of the 228s from Questar recently. I've had it out to the range 3 times now I think. I was noticing last Saturday, thinking in my head, "this thing is turning into a major tack driver". It has around 600 rounds through it now, and is really shooting to point of aim consistently.
I wouldn't worry about it too much. The guns are built tuff.