Have you tried Trail of Tears yet?
I live in Mashpee so I'll go to Otis or ToT depending how I feel lol.
I find with Otis if you stay to the right side its much flatter than riding near the highway side, or come in from Crane Wildlife management side into the Otis trails makes a nice ride.
Trail of Tears has it all from fire roads, single track/hills and meadows for riding.