I have to ask when you change oil your only putting in 4 1/2 quarts and when you check the oil the bike is Straight up an down and you screw the dip stick in till it just seats. Then check.
I'm not saying you don't know what your doing I'm asking if this is the way you do it.
Oh yes, did all of the above. And checked it several times over the last 1,500 miles since the last oil change and it was always at the correct level. I finally decided to remove 1/2 qt. Next morning, checked it cold, then rode 60 miles (hwy & city) and got it good and hot. Pulled it into the man cave...let it sit for a few minutes, checked it and it's right at the full mark! Not over and not under. Checked it again 10 minutes later...same thing. Maybe my wife added a 1/2 qt of Maple Syrup when I wasn't looking?
BTW, I checked the level several different ways:
1) by the book, sitting on it with it level and the dipstick clean, then bend down, screw in the dipstick, pull it out and look at it.
2) with the bike on the kick stand (or as Harley calls it the "jiffy stand"), pull the dipstick, wipe it, replace it and screw it in all the way. Straighten the handlebars, while alongside the muffler-side of the bike, pull the bike up towards me until it is level then let it rest back on the kickstand. Pull the dipstick and check the level.
3) When the engine it hot and the bike is on the kickstand, pull the dipstick...wipe it clean, screw it in then pull it back out. If the level is correct, there is oil about 3/8th inch from the bottom of the dipstick (best to use the same location in the garage for this method).