Twink war weapon advice for solo

[wagorf]

War is geared with fungi, CoF. Mid 30s using Staff of Battle while soloing. Also got Frostbringer, WESS, and Fist of Zek in bag.

Issue: Solo killing is getting slower and slower, it's also getting quite difficult to solo white/yellow mobs.

Question 1: At what level should I switch to dual wield to solo better? Never?

Question 2a: If I have to switch to dw to solo at later levels, what weapon combo should I use among the 3 weapons I carry?

Question 2b: What weapon would you recommend to purchase if I want to solo even better? This probably would cost at least a few k, so I'd like this to be a long term investment, not something I will never use post 50.

Question 3: Given my gear set, what is the fastest place for exp (solo) between lvl 35 - 40? 40-45? 45-50?

Question 4: I'd like to gain dwarf faction to acquire velious custom helm. What level can I start working on factions and get exp at the same time? What zones should I go? I doubt I can solo it with my gears?