I put big end failier on my last engine down to sump design / capacity , when the engine in doing 7000 rpm add a resonable G force eg in my case a roundabout , the oil simply does not fall into the bottom of the engine quick enough, the oil pump cavitates, your bearings are then running on bubbles instead of oil, I looked at lots of sumps including a similar version of the above , the Prodrive big wing , gated (with little rubber gates :-) work of art was around £3000,00 + vat the above from 120 ish , but in my opinion it is the increased capacity that is important, I finally ended up waiting 6 weeks for an ARC alloy big wing from japan , Holds about 6.5 l and is shaped internally to stop surge, a bit steep @ £550.00 ish , but the car has been through a lot worse than a roundabout now with no problems, I also altered the pickup to sump clearance from 15 mm standard (both standard sump & ARC ) to 6mm ( as used on wrc engines)
Have a good one
Tim