so you wanted a bonus that didn’t do much some times. Why? What’s the point in having +1 if it would not tip the scale to your favor half the time?
I mean - would you feel good about having a +1 and rolling a 9 for it simply to be bumped up to a 10 and giving you basically nothing different? With d6 that’s never the case
as to 1 and 6 on a d6 not being the results with bonus/penalty - it is the same for 1 and 12 on a d12 with the same bonus/penalty.
I just don’t see the reason for simply doubling every number but keeping same core mechanic. What’s the big difference between a 11 and a 12 chance of hitting either one of those is the same as any number on a d6.