snip I love my Speed Astir, but there is NO way to tighten the belts
enough to prevent cranial /canopy violent interference at maneuvering speed
ona bumpy daysnip

Had the same problem with my first LS-6a. The fix I came up with was to sew
velcro to the shoulder straps such that when you tightened them you could
connect the velcro. They'd stay tight.