How comfortable are you with your 8th function? It's supposed to be rather active - is it possible that you don't use it very much?
The ENTj's 8th function is . I can easily see that I'm not as prone to use it as an ENTp or ENFp, but neither do I perceive a problem with using it. I notice most clearly difficulties with in ISTjs and ISFjs. Descriptions say that for ENTjs, is most clearly seen as awareness of potential abilities and possible achievements, rather than as always looking for alternatives. I can believe that, from the point of view of ENTps, ENTjs can appear as narrow-minded.
But can it happen that the 8th function is somehow a rather weak one?