Need to know what loading data you are using,

The distances of the gas port from the  start of the chamber, and how much bore you have after the gas port.

If the spent case rims are being bend backwards from the ejection pull from the extractor.



Hence 22tcm works in a pistol build, since the round is just a necked down 9mm for the most part, but since it uses such a light bullet, it pressure curve does drop off quickly, and if the gas port is too far away from the chamber/does not have the needed amount of bore after the gas port, it will never charge the standard B/C, recoil spring, buffer enough to create a full stroke of the action with the faster powders is uses instead.  Its the same problem with 223 ammo that is using lighter than 50gr bullets with it faster burning powders as well.

Wolff springs has reduced tension buffer springs.

Will it be enough, really don't know, since the ammo with it short pressure spike may not be enough to start with.  Hence the round is really just a necked down 9mm round, running slightly slower burning powder than what I run in 9 major, but way lighter bullet that what I run in major ,so not a lot of  longer pressure in the bore to speak of in the first place.

This is the reason that I asked for your load, since in a 16" barrel, it opens up for a slower burning powder over the pistol loads to use more of the barrel for speed, and with a slower burning powder, would generate a longer gas pulse that may solve the problem isntead.  
As for the pistol loads that I do see published, they really belong in a AR Major set up blow back action instead.

So you can try the reduced tension spring with the pistol loads, and reduced spring, but as far as opening up the gas port any more, would not go that way instead.  Hence buffer stripped of weights is light enough already, and and it may end up at the point if you don't have a gas leak, having to bore the ID of the carrier to try to reduce some more weight in the precipitating mass isntead (or go to a light weight carrier).

Now I really have to ask why you decided to go to 22 tcm in an AR rig to begin with?
My 9mm AR rig is set up to run 9 major ammo, so talking 124gr cast powder coated bullet, running 2Kfps out of a 14.5" barrel with 1/3 less amount of powder you are using (since I cast and powder coat, about $.04 a round), blow back action running 10oz buffer and AR 10 carbine spring to keep the action cycle in check.  

So I can see the fact that you can run a 9mm lower and mags for the combo a positive due to the shorter round length, but since the round is not really producing the longer amount of gas that the AR gas system lock action was designed for in the first place, even with the gas port closer to the chamber, still still need to reduce the weight of the buffer and carrier, as well as reduced buffer spring tension, to get the rifle to cycle correctly using the pistol loads.  

So on that note, would get McGown on the phone, to go over the build and what is required to get it to cycle correctly in the first place with not standard items on the build.  Hence if they state that is should run with standard parts using standard pistol loading data and not, then make dam sure that you don't have a gas leak on hand.  The gas system on the barrel sounds to be factory so it should be well sealed (if not from them, then you need to double check it for leaks), but have you check to make sure that the carrier key is not leaking from the top of the carrier yet?