Got another report back. This engine likes redline. I was worried that I left the oil in too long, but it looks ok. I'm going to stick to 7500 mile intervals in the future. Car used one quart over 9000 miles and I made up with the race oil. If I used the street oil for make-up I could safely go 10k between changes.
Current fill is 50/50 of 40W race and their 10W-40 street oil. The car might see some track time this cycle, so I thought about adding a little viscosity to this batch.