Your talking about KNIFE edgeing the crank, yes that help's with oil slosh and it might verry well help us here,Let me draw up a plan and order a new batch of crank's and try this once more shall we
BTW Here is my 3 .18 beauty's
I will be building up the OS engine there by request of a certain some one on this forum

I need to find a good carb for it as that HPI is under sized for any real power.