Trust GXT 188 Fire button

[Mighty_Pig]

So I needed a new mouse and I wanted one with a fire button since I have used it a few times before when I was at my friend. So I bought the Trust GXT 188 mouse since it has software to customise the fire button. But unfortanly the fire button doesn't work as it should I think. 

The problem I am having is that when in-game (I mostly play Minecraft) it doesn't register the clicks. After that I did a online click per second test and even there it doesn't go as high as the mouse at my friends house did. (He got arround 13 cps and with my new mouse when I do double and I even tried with triple click I won't go higher than 12 cps)
Then I tested the fire key as a keyboard press. And this is what I tried. I did the fire times 10x and the delay 100ms. And the key "-" Which means it should type 10 "-" in 1 second. And with some testing it takes the mouse arround 2.5 seconds. 

 

So the problem is that the delay I put in isn't the excaly delay it is doing. Anyone knows how I can fix this problem?

 

Edit 1: Even more testing. So I tested the fire key with 2 clicks with a delay with 0 ms and I can get like 3-4 cps and if I use the normal button I get arround 6-8 cps.