I realize that I am in good company here when I state that I am a tone-a-holic. I like my guitar to sound great at gigs .... and be repeatably good at every gig. I use an American Strat with Lindy Fralin pickups.
Starting out, I tried the built in rigs that come with the Kemper. I still use one of them, but that is it. I have tried litterally every rig that comes with the Kemper, most of the rigs that have been raved about in these forums from the rig exchange, and I have collected a few purchased rigs from TAF to fill in where I couldn't quite get what I wanted.
I rarely left the rigs completely untouched. I frequently increased the clarity on distorted rigs, and I lowered or eliminated the delay on most cleans to taste. Some rigs from the stock rigs and rig exchange needed some equalization as well.
Here is what I ended up with:
Cleans:
Soldano SLO Clean by LasseLammert (Rig Exchange): This rig sound beautiful in every pickup position. It is just impossible to make sound bad no matter what I do. Think goo goo dolls "Slide" tone.
Chorused Surface by Kemper Amps (Shipped with Kemper): It is a little on the warm side of clean, but is really nice for a thick layered clean that fills in the mix nicely. The neck and neck, middle pickup positions are a bit washed out with this one, but everything else sounds great.
A-Goldfinger Clean by from TAF (And44): This rig gives a more natural clean .... a stringey clean if you will. Think something like the guitar line for Incubus "Drive". The rig works great in all pickup positions.
Classic Rock Low Gain
A-TwoRock 35 Clean+ from TAF: I boost the gain a little on this to get a bit more break up, but I love the way this rig barks and quacks depending on what pickup position you use. Think of the tone of the guitar on "Give me three steps".
TAF-TwoRock Jet Clean+ (TAF, but comes with Kemper): It is similar to the one above, but has a bit more bite and is a little clearer.
Classic Rock mid gain
A-TwoRock 35 Cranked (TAF): This is a very versatile rig. Depending on your propensity for heaviness, this may be as heavy as you need to go. It bites and growles very nicely and reacts beautifully to all pickup positions. Full up on the volume knob for "Hard to Handle", and roll off the volume and switch to the neck pickup for some growley blues.
High Gain Rock
JCM 900 HiGain 100W by J450N on the Rig Exchange: This is a very ballsey rig. I have had the best luck with this using pickup position bridge + middle. This gives a great Three Doors Down sound for songs like "Love Me When I'm Gone".
Really high gain Rock (Thick gain)
Boogie MARKIIC+ by Djemass on the Rig Exchange: Just WOW. This is my go to rig for stuff like Metalica "Sandman". If I use the bridge pickup it produces a beautiful bite that slices through the mix. Move back on the middle pickup or bridge+middle and you have a less in-your-face heavy sound. This is one of those rigs that just puts a smile on your face when you thump a palm mute followed by a ringing cord
Anyway, I just wanted to give a little back to the forum since I have gotten so much out of it. Hopefully this helps out a few others working out their performance rig setups. I have spent hundreds of hours getting to where I am now. With my rigs all in performances and volume balanced relative to each other, I can honestly say that I have NEVER had a better sounding rig in my life.