Ok...This ought to stir the pot...

If I read your post right you race roundly round and run engines restricted to flat tappet cams? Reason for proper geometry- to get the last horsepower you can out of the motor and also be able to rev past the power peak by a bunch so you can run a deeper gear for a harder charge coming off the corner? Also if you run a juice cam there is a measurable difference in different oils of the same weight. David Vizzard has talked about this, and did some testing of oils with different additives that worked better. I only run solid rollercams, so I don't have any info to pass along. But wouldn't it be nice if a guy found another 500 stable rpm than before , so you could run about 8 percent more rear gear? That 8 percent I believe would be a double winner. 8 percent more power multiplication PLUS an 8 percent rpm jump coming off the corner, which puts you up into more horsepower to boot.