40 points on any talent is the max u can get. So having 40 bulwark will result to 20% block. Assuming u have 20 bulwark on item and 10 on pet plus the 20 from the item piece (ring), you will still get 40 points on bulwark. The other 10 is useless. So what you need to do is to get an 80% block (base).
You can't have 25% block from 40 bulwark. 40 bulwark = 20% block for 5s. Check again your affixes.