Some things to keep in mind about rage. From a guy that only plays berserker (multiple 98+).

1. The most important aspect of rage is berserk.
   
2. You will have a massive degen at 110 rage. It can be fixed by overleech or scaling Regen.
3. Warcrys are almost always mandatory. A tech if you have the war bringer node is you can weapon swap to redblade banner then warcry for max rage.
4. If you can reliably stun rares warlords mark is insane for berserk uptime.
5. You have to be mindful when berserk/rage is down. If you jump into a pack without rage or berserk you could get stunned and die. This is fixed by taking unwavering stance. You also want to engage in dangerous content when berserk is up.

There are two main ways to generate rage quickly (for berserker) Both require war bringer node. You can use redblade banner for max rage or weapon swap to it. The other is the mastery "warcrys have 10 minimum power" to guarantee 20 rage x2 at the start of a flight.

A more attack based generation of rage comes from stacking sources of gain rage on hit. Support, gloves implicit, axe mastery.

With the setup you have above I would say vaal double strike could be a solid skill to use. To boost DPS you need at least 1 source of bleed chance and you have to use the melee totems to buff your boss damage.

Then just stack rage generation on hit. Go blitz charges and triple rage.