I do think though that the current lack of rake is messing with things a lot, roll centres rear weigh bias etc. Its really a fiunction of wehehr I setup the car properly as is(nitrons and springs), or set it up properly with the Cup r ohlins, and I am leaning that way because I know ultimately in year or two I'll end up there anyway.
So do I spend $ this winter on header and a tune, or shocks and springs. The V6 has pre cats in the manifold but no 3rd cat downstream as evoras do the stock setup is doing the motor no favors. Yeah do both, but budget intervenes, not least because the front drilled rotors are cracking and I need some slotted ones.
IMHO ….. get the alignment, rake and corner balance done correctly and test the car out -- dedicate a full day to testing and experiment with rebound and compression settings. Bring out some support to do (or help with) the work, so you can save your energy for driving.
Yes, that would add a bit of expense to the test day cost, but in the long run pay off. Changing springs for the Nitons would be easy to do, even at the track, for testing. Do you know what spring rates came on the car from Lotus? I've been on the UK based Lotus forum for the V6 Exige since the release of that model, read numerous posts by people there who track their V6 Cup car, and haven't heard any of them register the same handling issues/problems you have experienced running the stock Lotus proprietary Nitrons.
No doubt the Ohlins are a better setup but are also quite costly. And, even with the Ohlins on the CupR, we determined that softer front springs provided some improvement. We also did quite a bit of work on certain "hard" parts to enable us to get the requisite camber front and rear … milling front wheel hubs and relocating the rear guide plate to allow for greater adjustment of the eccentric camplate. My point -- putting Ohlins on your car alone will not be the magic bullet …. you will still need to do some testing/experimenting.
As for more power, I basically agree with Eldon, assuming you are on some sort of budget. As "mods" go though, headers and a tune should run you less than Ohlins, parts and labor included. Getting the power down exiting a corner should be "correctable" w/o changing the Nitons out. More power is always FUN.
I have to admit, I'm surprised to hear that there are "cats" in your stock exhaust manifolds -- I'd want those out ASAP.
BTW, did you get my PM regarding options for replacement rotors?