Duke,
I don't know if anyone told you or not, but I found that replacing the the cool down thermostat (pt. # 3-3037 or pt # off my dryer is 3-03037-2. A red wire with a black stripe went to one pole and a yellow wire with a green stripe went to the other.
I replaced it with a Supco AT021 adjustable thermostat, range 90-130 close on rise. It's been awhile since I did it but as I recall I set the stat to 100 degrees. The bell rings about 10 minutes before shut down, so unfortunately you have to look at the clock and and add about 10 minutes, more or less, depending on load. Then get the clothes out. You can adjust the cool down period with the new stat. Another brand of stat would probably work just as well, like Gemline or Robert Shaw.
I've found it makes all the differents in the world in HOH drying. Cool, less wrinkled clothes, much better lint collection for some reason (maybe less static cling?).
And shorter vent runs always seem to help. The vent run on my dryer was very short and a friend of mine commented that short run shouldn't need to be cleaned much. I checked it and it was pretty dirty. A quick run thru with the LintEater about once a year keeps things working pretty well.
Hope this helps someone and I haven't repeated myself.
B.