I install client rulers in a few places that would have them historically (Pergamon, Judea) but i tend to stick to the type III's until the Marian Reforms take effect. Then its all type II's.
From a strictly gameplay (vs roleplay) perspective, you should follow the guidance of the Europa Romanorum Thread in the Guides and AAR's section. Using the recruitment viewer, he generates a guide to what level regional MIC gives the most local troops in each province and deduces the best Gov type from that.
"Let us wrestle with the ineffable and see if we may not, in fact, eff it after all." -Dirk Gently, character of the late great Douglas Adams.
For the Romans, I just make a Type 3 or 4 whatever will let me hold the province without rioting. Then I upgrade to type 2. That's what I did in 81. That Gallic Province that has heavy cavalry would be the only one I'd leave as Type 4.
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