It depends on how the -8 is built. I built my -8A to be extra light (currently 1010 lbs), but most of the stuff the builder can choose to go lighter on is in the panel or firewall forward. So while most end up nose heavy mine is tail heavy. I can't load it anywhere near the forward CG limit, and am limited by aft CG rather than gross weight. I can't load it to gross without exceeding the aft CG limit.Everyone I know who flys an RV8 adds some ballasts to the cargo to ease how nose heavy it is with just one person. One friend said he prefers his 7 over his old 8 because of ballast loading. Fill seats and go fly instead of configuration changes with the 8. Add another 100 in front is not going to be friendly.
Mine is day vfr, O-160, wood prop, SD-8 alternator and small lithium battery. I would agree with other posters that a constant speed prop is worth the weight if you can afford the $.