Indeed, loss of starch and excess indigo is inevedible and desireable, nevermind weight. It will be quite consistent. Yes, density would incease. but by the time of soak yardage won't matter. That would be the only way to screw it up. With your method it won't be be screwed up. If there is any more shrink in them it will be marginal and have no effect. Personally only sized up on LVC they are quite big. Did you order to big size already? 24oz? I have no personal experince at those weights.