If you are doing a rebalance, then that is what you do - rebalance the whole enhancement....
Reduce the bulk of the white in zone 1, and debulk the flawless pink in zones 2 & 3 making it flush to the nail at the eponychium.
Reapply your whites into zone 1, apply your flawless into zone 2 & re-establish the new stress area (rebalancing the nail to give strength and correct placing of whites) then apply your zone 3.
When using flawless, apply zone 2 and feather it up to zone 3, then apply your zone 3 bead further down more onto the feathering you have just done in zone 2 and press and push up to finish zone 3.
You need to apply it like roof tiles, overlapping it onto the last bead, if that makes sense, that way, you will avoid any visible lines or marbling.
If you are just doing an infill, then you only need to buff over the whole nail lightly, but pay particular attention to the old grown down flawless in zone 3, ensuring you remove sufficient, so that when you apply your zone 3 bead, you can 'tile' it over the edge of the old zone 3 product. That way you will avoid getting the visible line.
I hope I've explained myself properly!!:hug: