In General ... every main rotor head is set up with 90° lead for the ingoing inputs. The reason ist simple physics, on a rotating system we have always 90° delay. This goes for each and every heli, no matter if flybar or flybarless and how many blades.
If you turn a blade over the tail boom and input elevator nose down it won't move! If you turn the blade on a CW system on the right side of the heli (90 deg to tail boom) it will move max. positive at elevator nose down.
This phase adjustment is built-in on 2-bladed flybarless or flybarred helis mechanically. On multiblade setups, often you don't have a good mechanical solution doing this of course. So set the head for best linkage layout vertical from blade grip to swash plate and do the final setup with our servo rotation in swash plate expert (5.0 pro needed).
90° is a starting position, fine tuning must be done in flight. For this do a quick fly-away from hover. If the heli wobbles on aileron first before accelerating on elevator nose down decrease the rotation by 5° steps. VBar can handle wrong settings up to 30° so a little offset won't have much effect. For example on our BO 105 with 4-bladed heads we have 70°. This value depends on blades, headspeed, dampening and weight.