The perfect ‘angle’ is dead center from the trans main shaft. Of course we can’t get that because of suspension travel but even 1degree uses up HP so try to get zero degrees going down the tract, the most axel movement only lasts about 1-1/2 seconds or less. If you set angle so it climbs to center on launch then it will be angled down the rest of the race, using HP. That’s when it should be centered. If you can watch the vid a dude made of u-joint over angling, big eye opener.