"Optimal" build for getting a 30 (15 * 2) damage shield basher would be 0/45 + 15 shield, achievable at level 32 dunno how many people got those bugged respecs though.
Funny thing is they can get 0/45, 15 shield, 14 athletics at level 36.
For the non-bugged shield bashers out there, 6/42 + 14 shield is the earliest build you can get 30 damage (6/3 + 14*2) with, achievable at level 33.
Sadly you can only get 9 athletics at 36 with 6/42.
I'm a bit interested in what crpg_nudge_knock_into_crouch_threshold is, it's only referenced once in the link.