I had a poorly done port by a no name company. Brett rebuilt my blower and ported it. Turn around was fast. The blower made the power that was expected.
I've sent several other lightning owners his way with similar results.
I posted his site.
I knew him a decade ago when he started home porting Eaton's for lightnings and cobras. That transformed into a full time business.
He does port work and rebuild on almost any blower out there.
Just Google the company.
Venture outside the LC community. Poke around lightning or Cadillac forums.
Having owned a supercharged rig since 2004 I've gotten acquainted with the companies that rebuild stock and aftermarket blowers.