Denon 3808ci set up?

[Fenix88]

I just got my denon 3808 and had some questions after running the audssey setup. My speakers are as follows Def Technology BP 2004(front Left & right)C/L/R 2002(center) BP2X(surr A L&R & surr back L&R) sub is a Mirage BPS 400. First does the audssey not do your surr backs when doing the test it only did a 5.1 test? Second it found my fronts as small even though specs say they have a freq response of 19-30khz. I did change the speaker config to large for my fronts. It found my center as small also but put the crossover at 80hz. I changed that to 40hz since specs say 30hz-30khz I figured 10 above would be safe. It also found my surr A as having a 80hz crossover again changed to 60hz since cut off says 45hz. I guess my questions is that alright to do with the audssey setup or should I have left it alone?