Hey all, it's the OP here who started this thread. Figured that I owed the community, especially any followers of this thread, an update on my FIST setup.
After about two months of driving on the Koni Orange struts at all 4 corners - always using the Cobb Sport springs combination - came to the conclusion that the front-end is just too compliant and soft. I dont mean from a ride-quality standpoint. It rides as smooth as the FIST is likely ever to get. Rather the compression rate is too low to absorb well rapid, harsh pitch changes without "crashing down" on the bump-stops. It doesn't happen that frequently or I would have discovered this shortcoming earlier on. But after it happened unexpectedly 3 or 4 times I began to experiment for situations that cause it.
Basically if the front-end (both sides) encounter a very abrupt surface level change at reasonable high speed (say over 35 mph) the whole front end can bottom out with a bang. That of course is a rare road condition but not impossible to find. In fact there's a certain bad road that I take on drive home every day and found a spot that could replicate the problem every time I hit it right (or wrong). The most disturbing situation however is one that a FIST needs to endure without failing, and thats a fast off-camber corner. When the front-end is pitched hard and turn-in forces are heavy the loaded wheel will hit the bump-stop hard. A real bang! Again found a corner that I could make it happen if I wanted to demonstrate it.
So for the solution that I've found and already installed.... I replaced the Koni Orange struts with Koni Yellow "Sport" struts on the front-end (2) only, keeping the rear Oranges. The Yellow Sports provide adjustable damping rate. Putting them on full firm completely eliminates the too much compression movement. Yes, the ride got a tad-bit (or more) harsher but still definitely way better and more controlled than the stock setup. The Koni Sports up front really hold traction well under very sporty driving. Those road places that badly disturbed the full (4) Orange struts setup are soaked up nicely by the front Yellows and rear Oranges.
My sincere apologies to anyone who moved on getting their own FIST riding on Koni Orange struts at all corners. Perhaps you won't find the "limits" as frequently as I did. What bothered me most wasn't the bump-stop hits happening too often, it was simply knowing that the suspension setup couldn't fully handle what the FIST is capable of delivering. So that's what led me to the Yellow Sports. I can only speculate that getting all 4 corners on Sports would be a sweet ride due to the ability to turn the rear struts down (softer) to probably match the fixed level of the Orange. I can confirm that keeping the less-expensive Orange struts on the rear hasn't felt like any kind of compromise in performance while preserving a great deal of the eliminated harshness of the stock ride.
I hope this helps many without upsetting some that may have followed my earlier advice.