I also find it odd they did nothing below 1,600 rpm. With a torque converter that stalls probably under that you probably have some nice throttle response and low end power gains to be realized. Try bringing those 0-1,000 rpm cells up to about 8-10° and smooth over to the idle area. I have run as much as 14° on a stock TBI at 800 rpm and 100 kpa without tip-in knock and they jump to life when you hit the go pedal.