You won't be too steep on SLR, unless you over rev it ( too much rear gear) on an 1/8 mile track, IMHO. If you race a delaybox class, you can launch at a lower rpm if need be. I have had good consistancy with 11.17 slr, much more than recomended by most, by launching at 3900 on a converter that flashes to 6200, running 8.60 1/4 mile with 550 cubes.