Answered Combat Help

I won't say much here, as I haven't had extreme amounts of time to experiment with updated gear, etc. But the chaotic maul should be one of the items you obtain if you plan on doing slayer. A few tasks can benefit greatly from having it, such as waterfiends, and wyverns (if you choose to kill them this way).

Also remember that if you plan on using a cannon, the cannon takes it's hits based off your accuracy bonuses. So using a longsword or maul in task where the cannon does the majority of the work, such as dagganoth's, greater demons in the forinthy dungeon, or even cave crawlers.

The maul would be useless at Wyvern, since you need a shield.
The cls is the best weapon in SLASH style at wyvern.
Mauling at Wyvern is kinda top of the line gear for survival.

And yes, you should cannon with the highest possible bonus, preferably cmaul

For your current gear, a rune plate/proselyte plate is enough imo.