Has anyone used the Omega 10" concentric coil on the G2?-----If so, how did it perform?----Is there ANY advantage in using that coil on the G2 versus the 5" DD or stock 11" DD?-----The Greek series coils (at least in the DD's) are inter-changable with the GBSE/G2.---Not sure about the concentrics.-------No guesses now--does anyone have any (concrete) info on this?---------Del