i get it - i also have a midnight blue car, so i know exactly where you are coming from
i also have a vinyl full bra kit, which i use frequently - there are a few problems with it:
1. at speed, the bra moves - this scuffs the paint, requiring buffing when you take it off
2. you cannot leave it on when it is raining, so during those times, you are unprotected (guess when the most amount of paint damaging crap is flying around?)
3. paint fades due to exposure to sun, and with the vinyl bra, it fades differently than the rest of the car
i mitigated number 1 by applying blue masking tape to the areas that get rubbed - it's a pain, but it works
i resolved number 2 by not driving in the rain - period
clear bra edge lines are ALWAYS going to be visible on any clear bra on any color car - it will vary from car to car, but they will always be there - the reflection of the material, regardless of who makes it, will never be the same as that of paint, whether with clear coat or without, light or dark color
these become even more visible when somebody fails to remove the wax from the edge (very common)
as for waiting for paint to be perfect, good luck - i totally repainted the car - before adding a clear bra, you have to wait 6 to 8 weeks for the paint to cure - you can either not drive it during that time, or you can apply the bra to the brand new chips and dings in the paint - either way, you are not likely to have a lot of luck there
the good news is that this kit should be fairly cheap (i'm guessing well under $300), so it won't be a big deal to get another one when you decide to repaint
i'll have more information in about a week