Did you test with the RaceChip RS enabled and if yes, what Map setting?
I have a 2018 Stinger GT2 with
HKS plugs. My only other mod is the RaceChip GTS set to Map 7. I had a Dyno performed using Dynapack.
Baseline results with chip disabled = 311.6Hp @ 6043rpms & 389.6lb-ft @3215rpms
RaceChip GTS enabled and set to Map 7 = 384.3Hp @ 5257rpms for a gain of 72.6Hp; 500.4lb-ft @ 2000rpms for a gain of 110.9lb-ft
Given that we are running on different dyno's from different shops you can't compare my numbers with yours, but what is important is to compare baseline numbers with the chip enabled vs disabled on the same dyno, same day to see what gains your getting. That is key.
With RaceChips RS on Map 6 you should be seeing a gain of at least 40Hp.