I probably shouldn't stick my oar in, never had one... but I do have plenty of Airweight experience.

1. Target loads are no fun in an Airweight, I can't imagine they're better in an Airlite. Just saying. I load my own, and have some real light loads I mix into practice sessions to help. But the thing that helps the most is bigger heavier grips.

2. I wouldn't worry about finding grips 1 oz lighter. I'd worry about shooting it with those grips.