THAT will depend on your track. Type of soil, banking, tire roll-out, engine performance, chassis setup, PLUS how you drive the mower all add up to how it will perform. If your track is gripping really good and you can apex early, that will allow you more top end speed at the end of the straight. If you have a dry-slick track and tight short turns, you will not be able to reach your target RPM as easily as you'd wish.
What I am trying to say is you are going to have to experiment. There is no do-all, be-all, end-all setup.