With recently learned info, I've also found out that my current list actually holds A LOT of ground. Specifically the ruling of "All bonus' are added after the base damage is calculated." What this means is that my blast damage calculation was completely incorrect. It starts at 10, goes down to 5, then all the rest of the damage is added on. This would make a full skyrocket shot do 21 damage on the hit with a 5 inch AoE blast template that forks out 16 damage AFTER being halved!!!
That's a massive disadvantage you've been playing at for a long time if you halved the damage after modifiers. Glad you figured it out .
Regarding other rules interactions in the list that you may/may not be aware of, Covenant and Deliverers do not play together well. The 'direct hit' condition on Flames of Wrath means that Idrians will set more things on fire than inaccurate rockets ever could.
Also, "It also means that Ashes to Ashes deals 16 damage to the original target". You've been corrected on that already.
When resolving their Combat Actions, two or more troopers with the Combined Ranged Attack advantage in the same unit can combine their ranged attacks against the same target. In order to participate in a combined ranged attack, a trooper must be able to declare a ranged attack against the intended target, be within range, and be in formation. Furthermore, a model that would automatically miss if attacking the target normally cannot participate in a combined ranged attack
So you can't use Deliverer Skyhammers CRA vs stealth targets(which is sad)