Cordes Performance has their knowledge and expertise in the LS platform. Sometimes customers come from out of state to have their Corvette, CTS, or Camaro to be worked on. Cordes' is well known in the Valley, and has build's that have won some awards (Street Car takeover, etc.)
However, this knowledge doesn't translate to other platforms. I always get the impression that performance shops each think that their crap doesn't stink and will try to tune everything. AFR is AFR, spark advance is spark advance, but if it was that simple then anyone can take their car anywhere for the same performance gains and quality.
The unfortunate reality, is that CPR simply doesn't have deep knowledge of the Coyote for the S197 or S550 platforms. When you hear things like "Cylinder #8 issue" or "550 RWHP is the most you can get out of these things" that doesn't instill confidence.
Keep in mind, a 550 RWHP build from CPR on the S197 platform is roughly $11,500. This is a Magnum supercharger, intercooler, long tube headers, fuel injectors, and a methanol injection kit. Meanwhile, other performance shops like JPC, VMP, Revan Racing, Griggs Racing, Lund, et. all, will hit 650 RWHP with an average of $8500 invested. On top of that, CPR doesn't tune the Coyote; tuning is farmed out to AZ Dyno Chip, or more recently, UMS Tuning.
If you are looking for a company to do half the job, poor cost/performance ratio, then I guess that's ok? I honestly do not get it. Stick to what you know; the LS platform. There is absolutely no shame in that, but don't pretend you're an expert on every car.
Shoot up to Modern Performance and Tuning (formerly Fox Body Performance), Arizona Elite Motorsports, or PBK Motorsports if you are looking for knowledgable people and companies for the Coyote. Else, have your car shipped to VMP or JPC.