rear wheel air deflectors

[lunarhighway]

since i'm getting incouraging results from the fairings i've put before the front wheels i've vinally decidet ist was time to do something about the rear wheels as well. at the time of this post the glue for the brackets to wich i'll attach the fairings is drying (as i didn't want to drill holes in an already rust prone area) but i'm still unsure about the size of the air deflectors

here's a sketch of the front view and of two things i'm considdering.

my dilema is: should i cover as much of the tire width as possible or will the air bleading of the straight fairing "jump" over the gap

does that make sence?

for referece the gti version of my car came with deflectors that had the profile of the last example but where faired with the sids rather than a flat barier (wich i intend to test before i'll considder something more advanced)