As the title asks... or do you leave it a 6 degrees?
The 6 degrees right rudder trim is of some help on takeoff but it should NOT be considered as critical to control left turning forces. RUDDER application is what is required to deal with any left turning forces during the takeoff run. The 6 degrees right trim will optimize your rudder forces required in the initial climb when power is reduced to 46 inches and 2700 RPM.
The thing with rudder trim on takeoff is that you want to set it up to help you but because of the tab's tiny area in relation to the rudder surface the tab itself is fairly ineffective due to lack of dynamic pressure on the tab during the exact speed range where the left turning forces are the worst on the aircraft; that area being between the time takeoff power is applied and when the tail comes up during the run.
As you gain speed during the run you also gain dynamic pressure on the tab and it begins to be of some use. By the time you rotate and stabilize in the climb and reduce the power and RPM to the climb setting, the 6 degrees right trim you have cranked in on the rudder becomes much more effective as an aid in maintaining a centered ball in the climb without having to stand on the right rudder pedal.
Hope this explanation is helpful to you.