You'll want to get the gimbal arm version of the FatBoy. It is a drop in replacement I believe. That will improve your bass quite a bit. Unipivot arms are bad news on a number of fronts. Manufacturers like Lyra specifically recommend against them. Makers like Graham and Basis go through all kinds of shenanigans' to stabilize them. The Basis arms are not even unipivots any more. They are bipivots.
Got a new (to me) VPI Aries for Xmas... what’s the arm upgrade path?
I’ve been doing some reading and I’m not sure I can tell if people universally think any of the newer arms except the fat boy are better than the original JMW 10 arm that’s on my Aries. Anyone know what I could expect if I went to the 10.5 or the 3D? Are those arms actual worth the money upgrades? Cartridges are Decca Super Gold, Denon 103r and an AT ART 7 on the way.