buy atty's with an adjustable 510 pin, yea they cost a bit more but well worth it imo.......i own a Sig100 and i have had no problems i adjusted my copper pin all the way down on my Sig, then adjusted my atty pin's to accommodate, been holding steady since day 1.
hopefully someone will come out with some better replacement pins soon, or Sig will send out replacements but i wouldn't hold my breath on the latter.