Defence bonus & damage reduction/conversion
In my campaign I use defence bonuses because of the generally lower numbers and quality of defensive magical items. I did something very much like what you did, Mercule, and gave my "armor heavy" class a defence bonus equal to that of a wizard, with a class ability (at about 4th level) that allowed them to stack the relatively low defence bonus with an armor bonus from armor.
I also included some damage reduction, but a very small amount, and that only for heavy armors, so only truly dedicated armor users could benefit most. I'm not sure how well it will work out in the long term-my players tend to make characters who use little armor anyway.
But I think that you would do well to avoid the damage reduction figures as outlined in UA; with defence bonus and armor bonus stacking, it will probably be too much.
I think that it might be interesting to use a damage conversion variant, however, and have been tooling around with the idea for my next campaign. The damage conversion rules simply make armor wearers less vulnerable to lethal damage, rather than being hard to hit and hard to damage at all. I am still thinking that I will reduce the numbers however; perhaps half of what they are listed as in UA. But really, it is just to encourage armor use in my campaigns; as it is, the ability to stack the defence bonus with an armor bonus should be enough incentive, and is powerful enough to make armor worthwhile.
In my campaign I use defence bonuses because of the generally lower numbers and quality of defensive magical items. I did something very much like what you did, Mercule, and gave my "armor heavy" class a defence bonus equal to that of a wizard, with a class ability (at about 4th level) that allowed them to stack the relatively low defence bonus with an armor bonus from armor.
I also included some damage reduction, but a very small amount, and that only for heavy armors, so only truly dedicated armor users could benefit most. I'm not sure how well it will work out in the long term-my players tend to make characters who use little armor anyway.
But I think that you would do well to avoid the damage reduction figures as outlined in UA; with defence bonus and armor bonus stacking, it will probably be too much.
I think that it might be interesting to use a damage conversion variant, however, and have been tooling around with the idea for my next campaign. The damage conversion rules simply make armor wearers less vulnerable to lethal damage, rather than being hard to hit and hard to damage at all. I am still thinking that I will reduce the numbers however; perhaps half of what they are listed as in UA. But really, it is just to encourage armor use in my campaigns; as it is, the ability to stack the defence bonus with an armor bonus should be enough incentive, and is powerful enough to make armor worthwhile.