I'm still using v4 and link below is my set up, now the difference is:
DPS: before 15K now 30K
GF: before 258% now 310%
MS: still 25%
PR: still 21
HP: still 27K
With those stats you should be able to hit 500k GPH.
I compare your stats with mine:
DPS: 35k (buffed) crits around 95000 while in Archon
GF: 299% (no follower)
MS: 12% (My toon leaves alot of gold on the ground with 13+% MS, I think it moves to the WP's too fast but could be different now)
PR: 20
HP: 16k
And my steady GPH is 460k, I do sometimes hit the 500 or 520k GPH but that's just where I'm lucky with 50+% cellar finds or just alot of big stacks of gold dropping.
Also make sure your toon isn't standing still or leaving the game instead of TP-leaving as this saves time.
I found out that DB already prints failrun times to the DB log/console while my toon is still waiting to leave the game so this may mess up stats a little bit.
Also make sure you are not dieing often because this costs time and alot of gold.
Check your pickup rules, your toon having to pick up less items raises your GPH for sure but do you want to miss out on all those items/essences which you can easily sell on AH for more gold? The gold you earn with that don't add up to your GPH figure but you sure as hell do earn alot of gold with these things.