[JasonB]

There is a rundown of track design software in the Manual. But basically if you are using a windows PC, then Ultimate Racer is the best, and SlotMan is a free if outdated alternative.

As for your track design, I think if you want more track or less space, then you may need to use more R1 corners, and/or go for some bridges and elevation...

This might look like a figure of eight, but technically it's not so it doesn't have equal lane lengths. There is plenty of track though, not too many R1s but poor visibility on one corner.

   

This one is a genuine figure of eight so has equal lane lengths, and perhaps more importantly if you are mostly racing on your own, an equal balance of right and left hand corners.

   

This one is a big bridge and valley design, which has the advantage of maximising the length of the main straight. However there are a lot of R1s, and visibility is poor on three of the corners.

   

Are you sure the dimensions you posted are correct, it's just your track looks bigger than that?