Heya guys, I have a question. After the thread regarding tire pressure came up, I decided I was gonna try 120 instead of my usual 100-110 psi to see how harsh it gets. Anyways, this would be my first time pumping the tires on my new P2C. Been riding it since picking it up from the LBS and noticed the pressure getting low. Anyways, I am not sure what the tire pressure was from the LBS but after filling it up to 120 psi, I noticed that my rear wheel rubs against the rear wheel cutout. I tried deflating it a tad to 115 psi but it still rubs. I decided to take off the back wheel and see what's up. I noticed that the inside of my rear wheel drop out has a rub mark down its middle, obviously from tire rubbing. No idea how long this has been going on but didn't realize it till today(the rubbing sound was rather apparent) Anyways, I tried to place the rear wheel back in but now it won't go in all the way into the C shaped thingamagick in the rear(the C where the skewers are rested on). I decided to just tighten it where it will go and the rubbing went away(there's more easily seen space between the cutout and the tire now compared to before where it looked rather tight).

So my question is, is the back C supposed to work like that? I mean adjustability in how deep you can place your skewers or am I risking it by not pushing it in all the way? If this is the case, how can I remedy the rubbing?