Honestly, and this is coming from someone who has only played GNB, I think you just aren't playing like a DPS when forced into DPS Junction. What I mean by that is GNB can push out a LOT of damage, both in DPS stance or Tank stance, but in DPS stance it can push out a targeted 26k burst in roughly a single GCD with Rough Divide > Double Down > Blasting Zone. Not a lot of jobs, let alone DPS, can snapshot that much damage in a short time frame not including LB's. With the almost 100% uptime on the speed boost from Rough Divide, when you are forced into DPS stance you have to play more like a guerrilla warfare fighter than a tank. Dive in, burst and hopefully secure a kill, speed boost out, rinse and repeat.

Now I will least agree that it would be nice if there was some sustain on GNB regardless of stance, like 50% life steal on Double Down or something. However, in the end it usually comes down to team skill vs team skill, even if you are against 5 DPS. If you can call targets, your 26k snapshot with any amount of damage from your teammates can usually insta kill if the damage or CC is there.

On a personal level, when it comes to crowd control, the more I think about it, the more I don't really want it. There is already a metric ton of crowd control in the mode, and I don't really want anymore tbh. IF they make GNB the equivalent of "my utility is my damage" I think I would be happy with that. As I stated earlier, I think a tiny bit of life steal regardless of stance would go a long way, but since the recent update I have been able to finally climb the Crystal ladder, something I could not have seen myself doing before.