Wow SIGMIK

impressive...I can see you are or probably approach musculoskeletal issues from a neuro perspective, which is often the better ways to go, you are right, exploring that activity that aggravates the problem, might be a better approach, it may seem time consuming but in the event of problems being vague, functional approaches will bring things into better light. This still comes to the issues that have to do with muscle imbalances(as vague as that term sounds).
A thourough examination of the lumbar spine, hip and Wikipedia reference-linkSIJ is necessary no doubt.

cheers for that good post...