Hi Idelwild,
When a person sends in a hair sample it usually is taken from the back for their head---where the hair is the darkest. And usually a customer doesn't have enough to take a sample from the front. Hair color gets slightly darker going from the front to back (and density gets thicker). The factory allows for this and there is a very slight color from front to back. However, not everyone is the same. Your color change is probably slightly more pronounced that average. So if you're not able to send a front hair sample we'll need to 'tweak' it. 3 color shades is a lot. I would suggest 1 or possibly 2 shades lighter in the front. Does the back of your unit match the color of the back of your head? If you we can keep that color.
The skin systems can be worn for 7-10 days but there are personal variables to take into consideration such as body chemistry, life style, etc. You'll need to experiment with it and see what you're comfortable with.
As for your the freestyle of your first unit, freestyle means no distinct style. The knotting is random and it allows you to experiment with different styles. You just ran into a freestyle venting that happened to fall into a center part. It's a random thing. On another freestyle order it could fall in a completely different place.
Regards,
John