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Your leak could be from the ram piston o-ring, front ram body o-ring, or even possibly from the ram body cap itself. You will notice a "seam" for lack of a better term in the ram body. This is where the front cap threads into the center of the ram body. From the factory it is cemented in place with red Loctite, but it can deteriorate over time and leak (although it's the least likely source of a leak in that area). Separating the front and middle ram sections is difficult. The best method is to clamp the ram body in a vise using soft wood or leather to protect the ram from the jaws, then clamp the front of the ram similarly in a vise grips/locking wrench. Heat the junction very generously with a butane torch or grill lighter and then turn the vise grips/locking wrench counter-clockwise. If you damage the ram body at all with the jaws of the vise or locking wrench, you can use a file to smooth it out. As long as you don't damage the o-ring gland, the only important thing about the ram body is that there isn't a protrusion significant enough to scratch the body of the gun when you install it.
As to your other problem with the ram failing to properly cycle, you most likely have not properly set the snap ring adjustment. Pages 12-13 of the manual describe the process of setting the snap ring. In short, you will need to hold the ram body in place using needle nose pliers, snap ring pliers, or the ram adjustment tool if you have it, then use a hex key to turn the hex nut in the center of the ram clockwise while dryfiring until the ram stops cycling. Back the hex nut out 1/4 turn and you're all set.
Before you do that, you will also need to ensure that your ram stroke is properly set. To do that, simply install the ram, then close the rotobreech and open it again. If you do not feel any resistance when opening and closing the rotobreech, turn the ram body clockwise while continuing to open and close the rotobreech until you feel a slight resistance or "click" when opening and closing the rotobreech. The "click" is the bolt pin meeting the back side of the hammer. If the ram stroke is improperly adjusted so that it is meeting the front side of the hammer you can have some cycling issues.
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