WHEN YOU USE MULTIPLE VKs for SAME HEALING REQUESTS AT THE SAME TIME, IT IS ADVISABLE TO USE THE BOOST METHOD.
For details and examples of BOOST method, please read this article on the link.
Suppose VK decides based on its wisdom to boost your healing by 2 times, being the best for you at that time.
So energy created by 1st VK is said “X amount”
By Second VK, the energy created would be double of X “2X” + “X” of 1st VK
By Third VK, the energy created would be double of 3X that is “6X”
By Fourth VK, the energy created would be double of “6X” ie “12 X”
So the total energy would be much higher than using only one VK.
So, when you want to speed up your healing or when the energy need is more, and you have multiple VKs, please use the BOOST method with same healing request.