I'll second Joeg's assessment.

Since all the rods have been on one "end" of the engine, it's possible that you have an oil starvation problem under hard cornering. I lost a couple of #4 rods in my old Honda before I figured it out - and an Accusump fixed it.

I also have a rod failure that was traced to a crank that was improperly ground, causing excess tolerance in the #3 main journal - which is where the oil was pumped into the crank. The result was that most of the ooil ran out of the bearing and back into the pan instead of pressurizing the crank properly.