In regards to your sub measurements, that is normal for a DSP sub, and should be left alone. It has been covered on many audyssey related forums over on AVS. My EP350's (non dsp) measure exactly the right distance, but my EP600 has always added 10-15ft to the physical measurement.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85