Make certain that your dealer has flushed the adaptive transmission memory, so that the car can have a fresh chance to accommodate itself to your particular driving style. I would suspect that the car had adapted its tip-in to the previous owner and you drive very differently. And ask the dealer to check both the ECM and TCM software to make certain that they are both current. I have the same XC70 as you, bought in January of 2012, and it didn't really shift and accelerate well until August of 2013, when the TCM software was upgraded for the second or third time. For the past 14 months, it has performed perfectly.
Current Volvos:
2015.5 V60 T5 Drive-E FWD Seashell/Beige, Platinum, Front Heat, BLIS, Urbane Wood, 18" Titania Rims
2015.5 V60 T5 Drive-E FWD Power Blue/Off-Black, Platinum, Front Heat, BLIS
Former Volvos:
2012 XC70 T6 AWD Twilight Bronze/Espresso-Sandstone; 2012 S60 T5 FWD Saville Grey/Off-Black; 2010 V70 3.2 Seashell/Sandstone; 2008 S40 T5 Orinoco Blue/Quartz; 2007 V50 T5 Barents Blue/Quartz
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