Maybe we need to get a professional engine builder to give a word here. I was once told to always assemble and break-in using non-detergent. The reason, I'm not quite sure. Maybe the non-detergent doesn’t kling to the cylinders as well and you get a quicker break-in. All I can say as a hobbiest and X drag racer, that’s the way I’ve always broke in a motor. Other than put-er in high gear and let-er eat.
If it aint broke, don’t try to fix it . . . . .
Don’t get me wrong, I’m not challenging your experience, but this is the way I’ve always done it.
Steve W.