For one you cannot increase the timing on PV5 which help quite a bit on the Gen 6 two I was under the assumption per the the Rapid Bike web site that :
"The Racing module’s most important benefit is, the so-called Auto-adaptive feature, that is the ability to correct automatically the injection map adjustment by reading the signal of the stock O2 sensor (lambda) while riding the bike." And I see the O2 compensating in the software.
Honestly in my humble opinion I love my sixth gen track bike which has a RB racing previously a PC3 I noticed a major difference in the entire rev range with the RB nevertheless a few horsepower on top in not going to make a difference in everyday scenarios even when you use a wideband O2 which is faster and more precise.