I am currently in the middle of my ir as well and have the priviledge of speaking wityh a couple of my friends currently flying jets. I have gone through it mentally in my head those that i personally know to have gotten jobs tend to be the ones who find it easy getting along with others, how the airlines managed to figure this out I dont know. I had a lenghty chat with a guy in his late thirties who just got a job as well and he told me the same thing that becauce in his airline the pilots tend to have some long days that is what they put as priority. Infact with the exception of one or two all of them are over thirty. Perhaps they are now looking for maturity.
Like somebody once said skills can be taught to peole (i'e in our own case flying skills) but you cannot teach personality (how to get along with others).
Best of luck.