Hi Bubba,
I have very mild asthma, it has always been a frustration of mine re this spirometry test. They have never picked up through tests that I have asthma. No signs of active asthma was CAAs conclusion. However because as a child I had clear signs of the disease, I was made in the late nineties to to check my peak flow before I went flying, which in my eyes was rediculous. I would peak flow at over 115%. Do you have asthma? If so you could do exercises to improve your lung capacity. Running, swimming are ideal for this, check though with your quack. Do you smoke? This is another issue that could cause a reduction in lung capacity. I have no issues getting a class 1, but I feel for you because I have had to do all these tests in the past to get my medical. Go through the hoops, I'm sure you will get there with it.