I think the Block rate table is inaccurate in the website.
00% fbr 3 fps
05% fbr 3 fps
10% fbr 3 fps
15% fbr 3 fps
20% fbr 3 fps
25% fbr 3 fps
30% fbr 3 fps
35% fbr 3 fps
40% fbr 3 fps
45% fbr 3 fps
50% fbr 2 fps

It should be:
FBR A B C D
-10% 4 5 6 7
-5% 4 5 6 7
00% 3 4 5 6
05% 3 4 5 6
10% 3 4 5 6
15% 3 4 5 6
20% 3 4 5 5
25% 3 3 4 5
30% 3 3 4 5
35% 2 3 4 5
40% 2 3 4 4
45% 2 3 4 4
50% 2 3 3 4
55% 2 3 3 4
60% 2 3 3 4
65% 2 3 3 4
70% 2 2 3 4
75% 2 2 3 3

A - Pal/Asn/Am
B - Barb
C - Sorc/WW/WB
D - Nec/Dru-Human

I've tested it on a paladin with Stormshield and shael SS. The block rate is the same. (35% fbr for 2 frame block)