Use conventional oil at 250 miles. If the rings are not broke in yet then you could hurt the ring seal. Not worth the risk. Do you want to take it apart and hone it and replace the rings again?
6 quarts is full for the pan What kind of driving do you do? Hard acceleration, corners or braking? How much RPM?
Mainly just cruising rural roads about 50 mph and getting on it when I can. Cruising about 2500-3200 and I’ve run it up to 5,000 so far gettin on the throttle but that’s it. Standard volume pump.