Having been out in the black - you really want to take the biggest scoop you can, you'll want the smallest A-rated power plant you can get away with to keep the temps down for those scorching moments you jump into a binary star system/white dwarf/neutron.
and 6A Fuel scoops are cheap (have you seen the price of the 7A and the 8A)
I agree with you about the Fuel scoop. Even if it is just for the pure joy of Star Skimming. It require a little more concentration but in inhabited space you are not sitting vulnerable to interdiction.
The downside is it takes a little more concentration and quick reflexes. It is not worthwhile doing if you want to scan everything. When you really want to get somewhere in a hurry you can easily do 2000Ly an hour.