You might consider France Park...about 45 minutes from Lafayette outside of Logansport. Like John stated, if you thought the Ampitheater didn't flow or was tight, then not much is going to work for you around Lafayette. France Park has more 2 track and several areas where there are large fields with paths cut into them that you may like.
Also, feel free to email me as I would be more than happy to give you more info and possibly meet up for a ride to show you around the trails @ France Park. Welcome back and good luck!