Firstly, concerning my wizard.
With bard song Song of the Orcslayer (40% spell dmg increase) and Godly Conversion 1, she readily crits for 93,500 with chaotic detonation. Finally got GC2 on my shaman, which should be a 5% dmg increase (making crits 98,175 if math serves me right), however I gained nothing.
Also attempted to add bard 2.0 buff Spirit of Vesagran, which should add 80% more spell dmg and my crits on CD only went to 110,500. They should be 176,715 (assuming 98,175 crit before 2.0) with song + gc2 + bard 2.0
Bard 2.0
8 : Effect type : Increase Mana by 150 per tick (total 0)
9 : Effect type : Increase Spell Damage by 80%
10 : Effect type : Increase All Skills Damage Modifier by 30%
11 : Effect type : Limit: Spell Type(Detrimental only)
Song of the Orcslayer
1 : Effect type : Increase Spell Damage by 40%
2 : Effect type : Increase Haste v3 by 40%
3 : Effect type : Limit: Effect(Hitpoints allowed)
4 : Effect type : Limit: Max Level (70)
5 : Effect type : Limit: Spell Type(Detrimental only)
6 : Effect type : Limit: Target ( excluded)
7 : Effect type : Limit: Target ( excluded)
8 : Effect type : Limit: Target ( excluded)
9 : Effect type : Limit: Target ( excluded)
10 : Effect type : Limit: Target ( excluded)
11 : Effect type : Limit: Combat Skills Not Allowed
Godly Conversion 2
2: Effect type : Increase Critical Dot Chance by 15%
5 : Effect type : Increase Critial Spell Chance by 15%
6 : Effect type : Increase All Skills Damage Modifier by 15%
There shouldn't be any stacking issues here.