No need to get radical yet. It is a little difficult to help with this stuff from one coast to the other. If you were near by, we could likely get you squared away in just a few hours, but we will do the best we can with what we have to work with.
If you want, mail me the 130 and I can use it in my round baler. Or maybe some one in your area has a round baler who can use it.
I thought the sisal was usually 9000. Do not get to discouraged, you have people here willing to set straight what the sales men mess up. Good twine is not that hard to come by. Around here the big "farm" store is TSC or Tractor Supply Co. They carry sisal small square, plastic round bale and plastic big square. I have never seen them to carry the plastic small square, but I digress. Good twine should not be that hard to come by, a box of 170-9600 should do 500 plus bales unless you are making them really small.
Were the bill hooks holding the thin 130? If so you may be fine to use 170 knot strength plastic. It usually comes in 7200 or 9600 balls. But your baler was never built when plastic twine was even conceived yet. Probably best to get everything working right with the sisal, and then you can try the plastic after you know the knotters are working properly.