My recommendation, please, bite the bullet, buy two more PL-200's and be done with trying to make your room come alive with only one subwoofer.
Just saying. In the simple, what you want, your room coming alive, isn't going happen with a single nearfield subwoofer.
Multiple subs aside, two points, one will "NEVER" get the best out of their subwoofer system if they've not taken the time to acquire room measuring capability and obtained a flat response within the capability of their system and two, without a continuous phase control, one is basically working with on and off or left and right but the individual is not going be able to fully phase align a system based on a 0 or 180 degree phase switch.
Again, just saying.
What type of AVR provided or ancillary EQ system do you have and have you run the EQ program you do have?