Not sure if he will make it to level 35. Besides that you should better max out your shieldskill instead of WM.
Yeah, probably not but... all the same, that build seems very solid and is one I'm considering. The combo of 8 Powerstrike and 7 Athletics is silly deadly. Shield/WM changed to taste. I had 7 shield skill for awhile and it was awful, the thing hardly ever broke!
For a level 30 build, though, in seriousness, I'd recommend having at least 18 agi/6 ath with the cleaver, so either 18/21 or 21/18 (the difference between 6-7 PS with a 1-hand is pretty minimal, though, so I'd go with the former and get more movement speed).
24/18 @ 31 would be an awesome build (8 PS, 6 Shield, 6 Ath).
Whatever you do, as a shielder your core skills are Powerstrike, Athletics, and of course Shield. Ironflesh, WM, and anything else can be added based on your preference.
Now we have to ask which one is wrong. The game mechanics thread or the calculator.
Use this calculator instead:
http://alpha-lider19.ru/MB/