Justin001

Go to the ELS download page and install the newer version of AdvancedHookV.

I'm not sure how you could do this with the normal LSPDFR backup, but, if you have Ultimate Backup installed you can set your backup's spawn distance in the .ini file (the line in the .ini is "// The default distance your backup will spawn as starting point. The higher the distance value, the longer they will arrive
BackupSpawnDistance=100").
 
The author removed his mods from this site but they can be found at https://bejoijo256.wixsite.com/bejoijo/post/ultimate-backup
 
I haven't tried this but maybe raise that number to 300, if that's not enough, keep raising it until you're happy. I have no idea how high you can actually make that number. In any case, if you do try this, please report back. I'm curious.

I solved the issue on my own. The vehicle that your using may not register as a police car. I found this out by rolling around code 3 and I noticed that with the car I was using, vehicles were not yielding. You need to go into carvaraitions.meta and make it to where it registers as one. I would just copy the car variation from POLICE and change the name to the vehicle that you are using. At the bottom it will say something like "vehiclesirenlights="0" you need to change that to 1.

Here's a solution.