Currently have a vintage 1980's Rega Planar 2 turntable with an older model RB250 tonearm. And a Gram Slee SE2 Phono Preamp. Trying to decide between the Carmen or the Zephyr. My friend who will be installing cartridge has a concern about the heavier weight of these cartridges. Am upgrading from an Audio Technica AT95E. Does anyone have any experience with these carts?