Madnes WD AP buff on 4 and V doesn't match description

[Spacenick]

I ran some test on Madness WD, the description of "Berzerk" says : +8%AP for 10sec when using Seismic Strike

 

Before using 4 I have 1713AP :

 

I use 4 on  nothing because it's "on use" so nothing else can proc :

 

1825/1713 = 1.065382 so a 6.5% increase instead of 8%

 

Blade Ward spec 1 is supposed to give 10%AP :

 

I start with the same stat as before, 1713ap, this is what i got in Blade Ward :

 

1854/1713 = 1.082311 so 8.23% increase instead of 10%

 

At my gear level that's represent a total 55ap missing on buffs that has 90+% uptime.

[Spacenick]

Same thing with the 1.2% AP stack from "Berserk" :
no equipment to proc nothing :

 

I used 1F to go through the dummy on Mushin's Hall to only do 1 hit and not proc blood ire :

The first stack work, 783/774 = 101.16% so as ap is rounded, i got the 1.2%ap buff

I then i fight the dummy for 10s with the same gear, so I should get 3 stacks, 3.6%ap buff :

787/774 =101.67% so for 3 stacks i got only a 1.67% buff instead of 3.6%

At my normal gear i have 1713ap so i'm missing ~32ap 

So with all those % issues i'm missing 87ap on 90+% uptime buffs.