As others have said, you need to make sure that your swash is in the middle of the gap between retaining collar and the base of the rotor head.
To do this you need to first remove the blades or back the motor away from the main gear to avoid injury. Then set your TX to send 50% pitch - I use throttle hold, set L to -100, 1 to 0, 2,M,3 to INHIBIT, 4 to 0 and finally H to 100. This way, you know that as long as your collective is roughly centred you have 50% pitch.
Bind the TX with the heli and make sure you are getting some servo movement. Set the collective stick to somewhere in the middle.
Then remove the screws and move your servo horns/arms so they are all as close to level as you can get them - ideally they should be completely horizontal.
With the horns level, adjust the links between servos and swash so that the swash is centred, level and moves from bottom to middle to top remaining level. If it doesn't, go back and recheck, re-adjust (be sure that the ball links are all in the same holes etc). If you hear the servos straining at either end, use the Travel adjust menu to reduce the PITCH travel (mine is at ~+/-55% with my slightly non-stock setup).
Once your swash is levelled and centred at halfway then you can go ahead and attach the swash to blade grip links - adjust these so that the bolts to hold the blades are vertical. Once you're good, go back and attach the main blades.
Check with a pitch gauge or at worst with both blades swept back together
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