IIRC, you have a single spreader, simple rig (upper and both forward and aft lower shrouds). So do we.
I adjust the forestay and backstay for recommended tension to keep the mast straight.
I use the backstay tensioner to tension the forestay when closehauled to beam reach and take it off when running and furling.
It doesn't do anything to the telephone pole mast, it just keeps the forestay "honest."
Our adjuster is a four part vang connected to a single line that goes through a Garhauer split backstay block.