hello sir, welcome to HCM, i had gone through your history and i want to give you some suggestions for increasing the lung volume and lung capacities when i found such patients with low lung capacities in my clinic, i was treating them like following treatment deep breathing exercise - diaphragmatic breathing 50 times once a day patient should be in flat position . keep both the hand on the abdomen. and both knees are bend. do breath in through nose and breath out through mouth. and feel the abdominal muscle contraction. this contraction increases the capacity of accessory muscle of respiration and will expand the lung volume blowing the flame of candle or blow out the paper 50 times inflate the balloon several times in a day pranayama is also useful respiratory exercise with spirometer is also vary beneficial . it increases lungs volume and capacities both markedly. i think this may help you thank u