My personal experience of remapped cars (on my 2nd now) is what some other people are saying in that it does take some time to feel the full benefit. I remember getting my
Ibiza remapped at Revo headquarters in Daventry a few days after they setup and the spirited drive home with another member of the site who had his
Ibiza remapped at the same time netted not quite the impact I was expecting but I vividly remember the next day thinking someone must have strapped a rocket booster to the boot as the transformation was amazing. So I concur with many on here that time and miles is required for the car to adapt to the new map.
What time frame and miles did you allow before putting it on the RR, did it go on straight away as if it did I think that maybe another major factor in the poor performance. Just make sure on friday you try an replicate the same conditions prior the thr RR then it won't introduce false factors !
Hope it sincerely turns out well for you though, good luck.