does version 37 rob power?

[flav]

i recently took in my MCS to get serviced. two of the problems were cold start and yo-yo. when i got it back it seems to drive a tad different. it seems to have abit more low end power. but when i get into the 4000-5500 range it seems to not have the kick it used to have? my car was built feb 2004. so what software version did it come with? i'm guessing version 36. right? so i assume they loaded version 37 this last service time. cold start problem is gone, yo-yo is gone. the power delivery is very smooth from the engine. it just seems to have lost the punch in the mid revs. and the supercharger noise is quieter now as well. is this in my head or is this a known issue with version 37? if so what do i do? its not that bad at all, i just want to know for curious reasons. it would also be nice to get that supercharger kick back.