Not sure if that's the case with the DS2500 but my DS Performance (a relatively new line...a tad lower than the 2500) requires a fair whack of heat before they work well even though it's a street oriented pad.
Try V-Sport here in Sydney,
V-Sport Australia highly recommended or Barrie Smith Motorsports
http://www.bsmsports.com.au/..
FYI, it's about 10% cheaper to bring them in from overseas when you factor in postage and the possibility of GST.
