1. I don’t know if there is such a thing as "Normal" engine temp on a Tiger, stock or not. It is usually a combination of cash spent on cooling improvements and dumb luck. Some motors run cool with a stock cooling system and some run hot no matter how much you spend. Also, engine temp in traffic goes up as the ambient temp goes up. On an 85 degree day, I am happy if it stays at 210 sitting in traffic. I panic about 230 and watch the oil pressure as much as the temp. The motor is a 302 with a mild cam.
2. Anything 25 psi or above at warm idle should be more than enough. Mine sits around 20 psi and goes down as the temp goes up. I just hold the idle a little higher to the point where it is at least 20 psi. Can’t afford that crate motor, yet.
3.It depends on how many miles you drive. I have been averaging about 2,000 a year and change the oil at least every six months regardless of how few miles it has been driven.
4. I use a name brand green coolant. I tried Redline Water Wetter and plain water but noticed no improvement in cooling and was concerned about rust, etc. so I switched back to a 50-50 mix.