Looser is always better with a fighting gun like the 1911
The ejector should be smaller then the it"s slot, it does nothing pertaining to shooting tighter groups you should be able to see light coming through from the barrel.
Even though now a days most people prefer a tighter frame to slide fit (Kimber 500 round break in) it also contributes to lose of reliability, the old GI 1911 of the world wars were real lose because they took in to consideration that mud and dirt would find it's way into the rails and they needed the guns to function period!! under all types of environment, now what tightens up your groups is the relationship between you barrel and bushing, in this case it's also a juggling act to tight will cause malfunction when the barrel tilts while recoiling, and to lose will produce poor accuracy, I think that the PT1911 has found that perfect balance with a tighter slide rails to frame fit, and the thicker ring around the front of the barrel allowing for the barrel to tilt and at the same time providing a tight fit (air gaged bushing), Try inserting a full magazine into your pistol and see if some of the rattle goes away.
Now if you notice that your groups are spread to far apart, I would recommend you replace your bushing with a EGW barrel bushing, you will need to measure the ID of the front of your slide and the OD of the front barrel ring thats unique to the PT1911, and provide this information to EGW and they will make you a custom barrel bushing tailored to you pistol, even though I don't think you will be able to tell much difference unless you ransom rest your the gun. Just relax and enjoy your gun and don't worry, the PT1911 basher don't know what the hell thier talking about.