All Mudras and Bandhas are totally useless for the new Aquarian era.
The techniques taught in 99% of yoga were useful in the Piscean era, which is over. Those techniques are antiquated and have very limited value today.
Rather than modifying the techniques Samael Aun Weor taught, practice them exactly and with patience: you will discover that the "ineffectiveness" is not due to the technique, but to your mind. Even though ham-sah appears simple, it is not. It is incredibly profound.