Unless you're doing high-incline (>=45 degrees) bench, you're not really hitting your shoulders as much as you may think. I'd leave the bench at low(15-20 degrees) incline and use that to focus on the chest. In any event, you might try doing Arnolds instead of militaries. Also, are you doing any rotator cuff exercises (DB external rotations, abductions, Cuban presses, L-laterals)? You might want to add some or all of these in, HST-style. First, they'll help with strengthening your cuffs (always a good thing, IMO), and, you'd be surprised how much these babies add to visibly bulking your shoulders, even though they hit muscles that are pretty much invisible!