In the case of the original (Ortofon OM5e I believe?) you have a cartridge compliance of 20 and the Tango is 12. Probable mismatch of cartridge and tonearm. The Grado's compliance is also 20. However, Project owners have complained about poor performance with Grados, you're not alone. A search of other forums will turn up several threads about this mismatch.
Dancing Cartridge.
I've got a problem with my analog system.With some records on not all cuts the cantilever and stylus start vibrating .It seems to be moving up and down and side to side.It does it mostly on the clear paths between cuts on the record and stops as soon it starts on the groves and some times it starts when playing a song.Some times it gets so bad it literally jumps from the grove.I've notice that if the record is a bit weared out it does it more often.On new or good condition records it hardly ever does it.I've got 3 cartridges.The only one it does not do it is with the one that came with the turntable.Bought a Grado Black just to have a diferent sound only to have this problem.Then I bought a Ortofon Tango moving coil cartridge and still have the problem.My turntable is a project expresion 2 fully leveled on a Lovan equipment stand.I've tweeked the azimuth,Vertical tracking angle,antiskating force,tracking force to no avail.Can somebody help me with this issue?Just in case it matters,rest of equipment is an Audible Illusions Modulus 3A,Mccormack DNA125 Magnepan 1.6qr everything connected with JPS superconductor cables.CDP is a Consonace Turandot.All equipments use JPS power cables.