The Concorde 20 was not a DJ model*; it used the same stylus that your current OM20 does. If you haven't had the new setup for very long, there may be additional cartridge break-in time needed (people commonly report improved sound, especially in terms of frequency balance, after 20-50 hours of play; nay-sayers call the phenomenon an owner-acclimation period). That said, I personally find the OM series brighter than I like in my system, and prefer the tonal balance I hear in models from Grado, Stanton, and Shure.
*There's nothing inherently wrong about using a DJ model in a home hi-fi system. For those who have rambunctious kids or pets, or who are fumble-fingered (or who have household members who are), a DJ model offers sturdy, reliable performance, and the slightly higher tracking forces may yield more stable tracking under conditions of less than ideal turntable placement/isolation and with running and leaping children or pets. The "concorde" style models available from either Ortofon or Stanton also free you from having to deal with alignment procedures.
Oh, and they can sound very good. I currently have an inexpensive Grado on my Linn, but also use a pair of Stanton 500's on a Stanton turntable--one for 78's and the other for lp's. I even used a 500AL on my Linn for a couple of years, getting good sound and reduced noise and distortion with the $0.25 bargain-bin records I had been picking up. One nice thing about your Technics is that, with a couple of extra headshells, you can easily interchange different cartridges to suit the needs of the moment.