I'm 2700 with 1/2 tank, no driver and an iron big block. I'm sure Allans car (running 24 psi) is lighter than mine.
I couldn't even make a guess on your alignement settings, just "rule of thumb" stuff as it varies so much from one replica to another. High speed stability you want some "toe in", 1/16 is good. Toe out or zero WILL make the car wander badly at speed, but can work great for SCCA "cone racing" events where your doing a lot of quick right/left stuff.
Again, SCCA cone racing you want negative camber (outside edge top of the tire leaning in, bottom edge out). But that will eat up the edges of your tires pretty quick on the street.
Best thing to do is try different pressures and see how it feels. The steering is "light", well that could be good or bad!
Keep an eye on the tire wear to see if your low or high "over time". To low will wear the edges and leave the center tread untouched. To high will wear the center and leave the edges untouched EXCEPT for where a large camber number is being used. Alignment is an "art" and there are no "magic numbers", just some better than others.