My opinion is that mechanical clockwork does not need exercising, ever. I know that some will dispute this 'heresy' but it is true.
The 'exercise' has done nothing other than temporarily loosen the gear grime, but that curtain slowness will come back with time. The timing gears must be gently flushed with a solvent (I use lighter fluid). The trick is to not get any in the RF area (unless you wish to remove the top to clean it after you wet it!). Gently squirt some directly onto the escape mechanism and timing gears, then quickly turn the body over to let it drip out. (Of course, this is done with the bottom off.) It should (hopefully) be filthy liquid that comes out. You might also try squirting some fluid onto the shutter button and film advance mechanisms, so that it flows directly to the bottom and comes out. Doing this with the body slightly slanted AWAY from the RF area will keep the liquid from entering the RF area.
Of course, Todd, if all the speeds seem OK, even when that body is very cold, the problem probably emanates from the first curtain not moving fast enough to avoid capping. One of those two curtain-tension screws must be tightened a little, as time (probably decades) can lessen the strength of those curtain springs. - David Lyga