I ran mine today (with other mods), and it felt really good. It felt better than my unmodified Cat by far, but I was struggling for power as I was running some lower power Lipo's than usual.... so I need to run it again with something with some bang in them.
The track today had some areas where traction was low, and the car squirmed on power, just like the std car did. But watching Nathan Waters and he clearly got the power down and made less of a deal about it.
So I reckon the mod using the Schumacher option parts is the way to go. Then trim 2mm off the rear of the flipped wishbones to recover a little bit of length in the wheelbase - just like Pupton said.
The driveshaft sweep will stiffen up the suspension on power, as the dogbone naturally wants to run straight at speed. So on acceleration it will stop the rear from squating, and drive the tyres into the ground creating some mechanical additional grip. At constant high speed, say on the straight, it will make the back end bob about. Could just balance this by softening the shocks..... but..... by putting the shocks on the back with the shift of weight etc, the shocks in theory should be a shade harder - so by not changing them atall we may be counter acting the driveshaft sweep effect...
Trial and error...... thats how I work, just try to learn from it...
(so I can ask you when I forget)