Thats why Using 2 or more VK is effective.
Sir I personally use 5 VK and usually i kept giving request to my 4 VK and kept them for different healings. One VK i usually kept wearing and giving some requests also. However my random thoughts can effect one VK i am wearing only and yes it very difficult to count thoughts.
Personally i usually do chanting GOLDEN SUNRISE or any related serum energy to kept my mind busy to avoid unusual random thoughts.
It is really helpful.