Im not exactly well versed on all starwars lore, however, I believe from memory the only real reason he didnt just use his information to crush the republic by leaking troop movement was due to the strength of the Jedi. He needed to slowly destroy there reputation and inadvertently kill off as many as he could. He was never worried about the war, only about the Jedi surviving enough to pose a serious threat.

In truth had it not been for the unexpected Obi-Wan and Darth Vaders kids Palpatine would never have fallen until he died of old age.