Your method is good.
5 min for each energy is also good.
As posted earlier to you energy will remain till its consumed. So charge for a new pack only.
Just wanted to tell you MAHA MRITYUNJAY MANTRA we generally use when there is a critical case or severe or repetitive illness. You can add need basis.
Same for Archangel Raphael.
Otherwise you can add IMMUNE SERUM and SHIELD OF 7 RAYS.
Generally maximum 5 energies per healing is recommended.
You can give 4 to 6 pills per dose.
In addition you can also charge your home water tank with general energies like HEART SERUM or EYE SERUM or GYM SERUM sometimes. Another way to supply additional energies.