So, I'm not an expert, but basically I run flat timing from just above idle to through the dead spot in the power band. You can extend the off idle ramp up a little to smooth the throttle off idle. I keep raising the timing here until I can't tell a difference. In my case I hit the limits of the Dynatek Ignition at 27*. Just as the pipe comes on I drop the timing to stock and add back until I can't tell a difference again. Then at peak power I add until I have signs of light deto then back the timing back down a degree or two. After peak power I drop the timing to about 5 degrees to allow for increased overrev. The dropping of the timing after peak power transfers heat from the cylinder to the pipe allowing for a broader powerband.
I mainly run curve 3, but will run 2 sometimes if its super hot out or bad fuel. My setup is a Pump Gas Ported 421 Serval with 24cc domes, PWK 33s, and SBIF Shearers. Throttle response is pretty good and I can overrev to about 11.3K to 11.5K rpm in 6th. This curve hasn't been dyno'd but I've been happy with it for the last 2 years or so. I could probably hold a little more timing between 10-11K but this has been a safe setup and I like it better than the stock curve or a +4.