Is there a way for the Polish- Lithuanian Commonwealth to cut down on the power of the nobility?

But not in this case.

Good way to achieve more decisive victory against Teutonic Order is to remove TO's ally Sigismund of Luxembourg from Hungarian throne (as Poles needed to leave significant force in the south to watch Hungarians) but if Sigismund is deposed (that was really close IOTL) or died while Hedwig of Anjou is alive and has kids with Jogaila then she (as last living daughter of Louis the Great) and Jogaila could be installed on Hungarian throne in place of Sigismund (reign of her father was remembered in Hungary as golden age).
Theoretically
 
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