I actually tested on another trinity core all_gm server, using the best healing gear and I can say that the dots have improved by 35%.
Also, I used icebreaker on MH and deathfrost on OH, with wonderful results.
I can't state 100% that this spec is viable on other servers. On an all_GM server you can't get banned )
A short guide for best spell gear. Just click the following links:
80 Plate Items - Healing
80 Back Items - Healing
Fingers + Trinkets + Neck
Offhands
1h SP Swords
Really fast OH Weps
DK Sigils:
Vengeful Heart
Haunted Dreams
That's all folx