Yep, I,ve had the same calf problem too and it was sciatic nerve related. And its true for me also that focusing on posture helped a lot, getting the hips forward under the trunk by activating your transverse abdominus. This minimises heel striking, and lets you land more forefooted.
OldSub4, I'm sorry I need to clarify what you wrote regarding "catching your footstrike" again. Am I right to interpret this as part of picking our feet up from the ground as quickly as possible, thus minimising ground contact time (and other stuff like overpronation)? This sounds like it could increase leg turnover as well.
You do have quicker feet and less ground time with striding, but more about when you foot hits the ground many runners will "grip" with the foot/soleus to take the shock, when you should let the heel hit and resist gravity above your knee in the larger muscles. If you perfect you will be on the ground less time, have quicker turnover, and send all the stress up to your upper legs which can handle the load.