I am currently on Eibach pro kit springs just to see what a difference from stock to springs to then coil overs feel like. I recently found out from my shop that my front right cv axle is throwing grease and needs replacing. So I’m wondering what is a safe lowering distance to hell reduce the chance of ruining cv axles?. And what the best coil overs are for street use and occasional track days?

No "best" coil-over. Look at the AWD coil-over list for the options available to you.

I don't believe your axle boot issue has anything to do with axle angle. These things just give out over time.