Novice at Analog, need recommendations.

I am a Novice at Analog Record playing. Spent most of the last 15 years listening to CD. Current System consists of a refurbished Thorens TD-160 Turntable with a new Grado Silver Cartridge, Space Tech Lab P-102 Vacuum Tube Phono Stage, Space Tech Lab A-102 Integrated/Headphone Vacuum Tube Amp, driving a pair of Grado RS-1's. Mid-range sounds very weak, and so does low level information. The Cartridge was aligned by reputable, and knowledgable dealer. Can this be the Cartridge is not broken in yet? Could it be the Phono-stage? Any recommendations for improvement and up-grading? A-102 and RS-1 sound great with Digital/Analog front end.