Along the other FR and the 345 you own all FR/ikeda are perhaps the worst qualituy performance tonearm design ever ( yes, it looks fine but at least me I don't buy because the " look ".), I owned both FR and Ikeda ones.
Problem is that those designs are undamped/way resonant and second are balanced designs and just rings as a " bell " using a non-adequated mechanism to set the VTF ( @billwojo . )
You said you own the Lustre GST 801 that it's a balanced design using a rigth mechanism to set the VTF, this has a name: engineering and knowledge levels that Ikeda just has not or forgot it.
You own good vintage tonearms ( but the FR/Ikeda ) but instead of that PUA-7 you need the Sony PUA-237/282 and you don't own yet the best vintage tonearm ever: MAX 237/282.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.