I've never flown the S61, but ISTM this is a general question anyway. In the 412, everyone I know sets the ADI to indicate 4-5 degrees nose-up on the ground, because that's the way the aircraft sits. In the S76, I set it to level on the ground, because that's the way it sits. Then I know what a level attitude is on takeoff and climbout. This often works for cruise flight, but I may change it depending on the load and CG. The only time I see a big difference is when I slow down for an approach, and then you generally have to maintain a nose-high indication for level flight. I used to reset it, but lately I've been leaving it as is, and mentally compensating, because every power change requires a new setting. I'm not sure how others do it.