I believe any time one of your dice is a 1, it would be less damage
1,1 = 2 damage instead of 3
1,2 = 3 damage instead of 4
1,3 = 4 damage instead of 5
1,4 = 5 damage instead of 6
1,5 = 6 damage instead of 7
1,6 = 7 damage instead of 8
Let’s see…. so any time one of the dice is a 2 and your other dice is >1, it’s doing the same damage
2,2 = 4 damage, would be 4 anyway
2,3 = 5 damage, would be 5 anyway
2,4 = 6 damge, would be 6
2,5 = 7 damage, would be 7
2,6 = 8 damage, would be 8
I’m not suggesting that you add 2 to the total of 2 dice.
I’m merely pointing out that on several different rolls your rule is actually causing less damage than the 2nd edition rules :-)
So any time one of the 2 dice is a 1, you are actually nerfing heavy bombers even further. Any time one of the dice is a 2, you are not making them any deadlier than the normal rules.
Anyway, I’m not sure you realized that it’s not just with snake-eyes that you’re doing even less damage.
6 out of 36 possible rolls you are actually doing less damage, and 5 out of 36 rolls you are not increasing the damage at all.
Which means 25/36 rolls you are increasing the damage by 1 to 4 points.
Your house rule does increase damage a little bit on average. It just strikes me as funny that your remedy to reduce the nerf on heavy bombers actually increases the nerf 1/6 of the time on SBR :-)