That's my mistake. So the total with the new numbers is in fact 237.25, versus the old numbers' value of 264 with Bruising. Without Bruising, it's 220, for a total increase of 17.25, barely noticeable.
In the interest of getting some numbers that more closely represent actual gameplay, here's what the same attack (100 damage base, 95% damage enhancement, 1 stack of Rage) would be after some purple patch on higher level foes:
Old Values, no Bruising
+1 (90% effective): 198
+2 (80% effective): 176
+3 (65% effective): 143
+4 (48% effective): 105.6
Old Values, with Bruising
+1: (220 * 0.9) * (1 + (0.2 * 0.9)) = 233.64
+2: (220 * 0.8) * (1 + (0.2 * 0.8)) = 204.16
+3: (220 * 0.65) * (1 + (0.2 * 0.65)) = 161.59
+4: (220 * 0.48) * (1 + (0.2 * 0.48)) = 115.7376
New Values:
+1 (90% effective): 213.525
+2 (80% effective): 189.8
+3 (65% effective): 154.2125
+4 (48% effective): 113.88
At this point, a Super Strength Tanker has absolutely nothing to look forward to with this patch any more. No more extra endurance, no getting to skip Jab, worse single-target damage, and AoE damage only better by an unnoticeable amount.