Each of the CFX's I've had has had the same breech problem...and it's so easy to fix, usually. They each were hard to align the pellet with the chamber because the loading block over-rotated just a little bit. There are several ways to fix it, other than total disassembly of the rifle. All you need do is restrict the rotation a few thou by whatever means you find attractive. The first one I did, I took the operating lever out of the block and put a drop of epoxy at the top part where it contacts the opposite of the opening. Let it cure for a few minutes and then rotated it to its open position, with a pellet setting in there, waiting to drop into the chamber. I pointed the rifle down, moved the block until the pillet slpped into the chamber and then held it there for a few seconds before closing it again to let it cure. Very simple solution and it works great.
Just be sure you move the cocking lever a few inches,and hold it, while rotating the loading block in either direction or you'll probably damage the O ring. After moving the block, return the cocking lever to its seat.
Another way is to take a piece of masking tape, cut two pieces the same size so they'll fit on the breech opening where the block's lever stops, clean the little area with some alcohol and stick the tape on there. It stops the block from over-rotating. Sometimes 1 piece will do, other times it takes 2. Never found it to take 3. This is an expedient, of course, but it'll last longer than you'd think. It sure makes the CFX a lot more pleasant to shoot.
BTW, once in a while the block will stop in alignment with the chamber but it's jut a little bit too high, right at the opening. This takes a bit of 'smithing to fix but still doesn't mean a disassembly.
