I too use Orly polish, In my opinion you will occasionally get a bit of white on the skin, this proves that you are ensuring all corners of the nail are covered. I feel that in a french mani situation, it is o.k to clean up afterwards. The explaination to client being, to ensure all of nail is covered, you will occasionally touch the skin.
I load brush (don't do too thin as will streak, not too thick as it won't dry) go from left to centre then right to centre. If nail is naturally very smiley take your lines down on an angle then one brush over the centre to make it more rounded.