Vests are not for everyone. I have an Afflovest and found it helped with clearance but wasn't magic. Alas, it gave me rib pain after a while. Now it's mostly sits idle but every now and then I'll put it on if I feel like I need a bit extra help. I've read that posture is very important with vest usage. Some RTs suggest sitting in a straight-back chair as upright as possible during vest treatment, which you might try.

I've concluded the best way for me, until they come up with something different for airway clearance, is levalbuterol or albuterol first followed by 7% saline. So far this routine helps to keep my airways clear as possible.