1999 7.3l smokes blue/white smoke after engine warm
 

Only blows blue/white smoke when it's warm and rev the engine, no smoke at idle. Maybe leak around injector?

Possibly leaking around the turbo

Any other ideas?

Any oil in fuel filter bowl?

Have you checked for shaft play in the turbo? Does it sound any different? Mine was doing the same thing, ended up being the turbo gaskets / O-rings. If you catch it in time you can rebuild yours for less than $200. If you let it go for too long, you can do damage to the housing and the turbo will be non-rebuildable. New factory Garrett assembly = $750.