sw21t

Hey guys, I have an 07 is250 awd that I'm looking to lower. The only thing holding me back is, that I keep reading about vibration issues after the drop. That the cv axle get angled too much because of the drop. Not really clear on the issue, could this be because the drop in general or the type of Springs being used.

Personally I'm looking at the Tien Springs or H&R Springs. Any feedback would be appreciated to see if it's worth dropping.