How much the board turns also depends on your fin setup. A single fin setup will let you make more long drawn out turns while a tri fin setup will give you more turning ability so you could just mess around with that and see how you like it.
After much reading, advice here, and shopping, I bought myself a Rainbow Rake 9" Longboard fin to replace the 8". Installed it toward the front of the box and took it to Surfside on Saturday. Turns are better; I can trim into and across the face now, and take-off is still much better than the thruster set up. When the board stalls, and I walk forward, it's a little to wobbly, so think I will move it back in the box next time, but overall I think this is the ticket. Loving the longboard now and anticipating more long rides as skills improve. Thanks again for all the input and encouragement.