I would think with the BOV being that far from the MAF sensor that yes you could run a spring that opens up at idle with no issues, but it doesn't appear to be the case according to @
evo4g63 . I can't see the info from TiAL you posted since it is a tinypic. Can you link me to it on the Tial website? Here is their info on picking the right spring:
http://www.tialsport.com/documents/w3_tial_qqr_sp.pdf