You have missed the point of the warrior tool set. Inner release in deliverance is warrior's highest potency move, because it is not augmented by tank stance, and it is up frequently this will balance out with the less frequent bloodspiller.
The 475 bloodspillers are nice, but is lowered slightly by tank stance, and also less frequently used compared to inner beast. You can make this look as bad as you want by comparing base potency to base potency without factoring in things like damage buffs and stance penalties. You can also wave your hands at things like salted earth and other Dark oGCD's without even mentioning that warrior has some as well, but you aren't really presenting a balanced case, it seems more like you are intentionally skewing things to make a point.
All tanks lose about the same percentage of their dps in tank stance. Warrior does more damage out of tank stance compared to dark knight, and so I expect it to be higher when both have similar penalties imposed. You can wave your hands at combo potency as much as you please, but nothing short of an excel spreadsheet and damage calculator would convince me that the difference in potency is unbalanced between the two in tank stance, especially compared to the relatively simple argument many have presented before you.
As far as the stance changing immediately hurting your dps you can stop it by: planning an unchained use to minimize it to nearly nothing and even gain dps on moves like upheaval to minimize any losses even further. The main point here is that if you needed that clutch self heal on warrior you can go into tank stance and gain access easily, all moves involved are oGCD. Dark Knight loses a GCD going into tank stance and then spends 3 GCD's trying to restore its HP at an 80% reduction thanks to tank stance. The main point here being that if you are about to die the non optimal thing to do is to continue to dps and not try to save yourself.