After some research found following:
Issues mostly on back; Floor to waist determine overall length; Inseam determines leg length; f/w minus inseam = torso length.
Too much leg length = excess wrinkles - back leg in my case.

When I tried reducing just the back conformed measurement, all it did was make the back crotch seam too short so it didn't reach my waist. As a result I am wary of trying this solution - such a cost in time / fabric / patience if the whole waist to crotch is then too short. What am I missing? Any suggestions / support would be much appreciated. Jancie