The Gov doesn't really control Downshifts. The TV/ThrottleValve oil & TV Mod. Downshift Valve oil act against the Gov for downshifts.
Not all Valvebodies will do a Part Throttle downshift. Some require a Full Throttle stab for a 4-3, 4-2* & 3-2 downshift, called a Detent downshift.
It's very complicated & difficult to explain.
If you can find a "GM 200-4R Principles of Operation" manual, it has all the oil flow schematics & mechanical diagrams etc..
CK Performance has a very nice 200 Pg. Technical Manual that also has this Info. www.CKPerformance.com
Lightening the Large weight will cause later/higher rpm Part Throttle upshifts .
Removing the Spring from Large weight will also raise shift point rpm/speed.
* Not all Valvebodies will do a 4-2 downshift.
I think the large weight on the governor is for down shifts but not sure what else it may be doing..
so if i lightened it up a little, would it my 200 4r down shift a little sooner? I was told also that if i remove the spring from the larger weight, that my wide open shifts would be higher, but not sure. If you know, let me know. DON