Totally ignore that chart. That chart basically says you can pass said current without the insulation being compromised.
What you should care about, is the acceptable voltage drop at the end points and any local codes you have to follow
The other issues which I can't help you with is conduit, number of conductors and ambient.
My major affiliation with silicon insulated wire was an arc lamp that needed to support a 40 kV start pulse and a 40A operating current at 20V. Each single cable was about 5' long
When you calculate voltage drop, you "typically" have to use 2x the "wire length". A light bulb 40' away from the breaker panel has 80' of wire that the current is traversing contributing to the drop.
real basic equations are p=RL/A where p(Rho) is a material property in ohm-cm, ItR is the resitance, L is the length, and A is the cross-sectional area. Wire tables use ohms/1000' Units have to work out.
Just recently, I bought a number of spools of maybe 20 AWG wire in various colors. It's definately more flexible.