Hi LGN1,
In GWX you are really alerted too early by RWR in late war. "Rubini's rocket fix", make it less easy.
Anyhow, I use a version where I am frequently attacked by planes. A lot of times the planes are just detected visually, but too late.
I run a self modded Sh3, but I can point to you where you need to look to make the RWR less effective and yet with some randomness.
Another easy way is to just decrease their max range on sensors.dat using s3d. Put there a precise range=500m or less and a max range at your taste/preferences accordingly the type of RWR. This already will produce detections ranges very short some times.