I haven't tried any of the Peterson mods on my Gyrodec (there seem to be polarized opinions on the Peterson mods) but I think that playing vinyl with the dustcover on the Gyro (up or down) is a bad idea if you're seeking the best sound quality.
As to the original poster's question, I think that an arm upgrade would probably be an obvious choice unless one wants to go to a totally different table.
As to the original poster's question, I think that an arm upgrade would probably be an obvious choice unless one wants to go to a totally different table.