That's a pretty serious set up. I race my Sapphire on standard rear beam, coilovers, alloy rear diff mount, standard ARB at the front and back and very stiff polybushes. I use 3 door hubs too.

My mate who races and wins in his 3 door has recently taken the compression struts off in favour of standard ARB.

Neither of us use adjustable TCAs.

I think you may be going overboard for a road car that may ocassionally see the track.

You should go for rear 4X4 brakes - bigger caliper and vented discs. Mine ate pads on a 2WD setup as they get very hot.

In answer to your question 3 door hubs are better - the geometry aids turn-in (reduces understeer).

Charlie