Haven't heard about this theory, but I've done that same as you, added more when it was low and voila, too much appeared.
Originally Posted by jsoque
Decided that before tomorrow's oil change, after the final ride of the season, I'll park the bike first on the side stand for a while, before putting it on the centre stand to drain. Usually I just come in from a ride, park it on the centre stand and drain. This does not allow the oil flow out of the heads before starting the drain, and maybe trapping old oil inside, to produce too much oil later.
Retired and riding my RTs, the '87 K100 & the '98 R1100 !