I can visualize this, but yes a sketch and or photo is worth a thousand words.
Google image search:
vent wheel well car
Superhachi.com - Downforce Basics
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The wheel wells are another area where an undesired pressure differential can develop. Air flowing beneath the car stagnates on the tires, creating an area of high pressure. This effect is compounded by the brake cooling ducts that many teams use, which force even more air into the wheel wells. All of this air is also heated by the brakes, creating the same buoyant forces as in the engine bay. This high pressure area also exerts a drag force on the car. For this reason, many race cars and high performance road cars also incorporate
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In my opinion, you don't have a race car with extreme forces,
so go ahead and pull the trailing edge back in flush with the body.
Just a guess, but your venting needs are not that great.
The examples I've all found deal with the front wheels which turn and allow air in.
At the rear I'm guessing this sudden influx of air pressure does not happen because the wheels remain parallel to the direction of travel.
Again I have no data or experience to share, just using my imagination to reverse engineer what I have seen and read.
EDIT:
I found an example of a rear wheel vent, but once again it is a very wide tire in a race car which could trap a lot of pressure in the wheel well.
An Introduction To Racecar Aerodynamics & How Aero Can Improve Your Laptimes - The Tuners Group
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It is important of course to use properly designed aero parts that are tested and proven to work - parts that create additional downforce without creating excessive additional drag.
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Yea, just thinking the open trailing edge on your rear wheel skirts will create more drag than they resolve via lowering or internal pressure.