Clive, You are a man who has tried a few types from what I remember. How have the trials for PI springs gone? have you tried the others spax,weitec and apex etc?
It's strange but the PIs feel different on 2 near identical cars both with new std shocks!?
The slightly softer feel is with the nearly new set, very little used, & feels very good indeed. Perhaps the new set will settle after a few more miles?
Apex were TS fitted on a V6 & were a bit too bouncy IMO.
I've got FK coilovers which feel good on the J10 Spider but I also had a set on G6 GTV when I bought it & they were set far too hard, (the car was in the air more than on the ground!) & in the end I gave up with them as a front started leaking before I found a good setting.
The 2 I've got with Koni's, 1 on std springs & the other on Eibachs, seem better IMO.
All of them felt good when being driven hard under heavy loading but some felt too bouncy when 'cruising'.
Sorry I can't be of more help but I'm still in the 'slow' process of trying different set ups.
If I'm honest new std shocks & springs still give the best all round ride, they just don't look so good though.