The general consensus on the facebook forum is that the 3.0 non-RS is about an equal to the 3.7.
A couple of things could be in play here - those 'big' 19's on your S are HEAVY. You mention the 3.0 had little 17s - but I am betting they are far lighter than the 19s. People don't seem to get how much heavy wheels/tires impact performance in every way.
I've had a few informal runs against a Silver Sport - (I have a '15) - they pull away just a bit from the start, but the 3.7 reels them in in the upper reaches of the tach. Having said that - you can modify/tune the 3.0t into a monster relatively easily...not so much with the 3.7.
Anyway - enjoy both. Neither are a slouch when compared to most other cars on the road...
2018 Q50S Red Sport - Dynamic Sunstone Red - Sensory, ProActive, Conventional High Performance Tires, Spare Tire Pkg, Illuminated Kickplates, Radiant Grill Emblem