I strongly disagree with your analysis of Gunslinger's Trance not being worth it. I run that perk almost exclusively, and when using a mid-RoF hand cannon or a good Pulse rifle, I easily see all three stacks and keep it going for a good amount of time. The 15 seconds is way more than enough to land multiple headshot kills in PvP, and especially with Pulses can make a huge difference in giving you an advantage over other players. It is well worth the perk slot when you can double kill MIDA users with a laser beam burst cross map again and again.
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For sure man, if you can get it to proc two or three times consistently, I can see the benefits of running it with certain weapons.