For What purpose did you buy the hawg? Conceal carry, personal protection ? Or a range gun for target practice ? Because if it's your conceal carry weapon as Para intended for it to be your trying to feed the wrong type ammunition. The angle of the feed ramp is all wrong for most types of hardball. Try Blazer or Wolf, they are cone shaped and feed better than the shorter hardballs. For carry ammo I would think you would want to feed hollow point ammo. A lot of it nowadays is +P. Para has kept the feed ramp angle steep so as to allow the casing to be totally enclosed by barrel chamber to avoid " blowouts " which would cause damage to the gun and possibly to the user. ie.... lawsuits..... Go to Keltec forum they have a picture of what we are talking about.
If this were a range gun, say a P18-9 like mine I would lesson the feed ramp angle as to allow your Winchester hardball or my lighter hardball handloads. As for the rounds jamming at the top of chamber. Take magazine springs out and stretch them half again longer than they were and put them back in. Springs will collapse when you keep them fully suppressed in magazine. Yes, Wolf springs will collapse too.
Your extraction problem would be considered a warrantable issue if you would like to send it to the factory as they would urge you to do. Or you can take the extractor apart yourself, stretch the spring a little to acheive proper tension. You will need 2 pairs of pliers for this and is a simple task. Good luck with your your new Para.