Good string for slack tricks?

So, up until now I have always avoided slack tricks, not because I’m bad at them but because my string is horrible. Every time I pinch the string the slack string starts twisting up and its almost impossible to do slack tricks like that. I can adjust the tension so that it’s just right and doesn’t twist up but after a couple of throws it just gets tighter and its impossible to do the tricks. I don’t even know what my string is called, its probably some type of cheap polyester string that came with an order, but I have plenty of it so I have been using those for a while now. But anyway, what are some good strings that are good for slack and hold their tension well?

You need to make sure you’re constantly adjusting your string tension to avoid the “twisting up” part.

Pros during their freestyles usually do this after a few lengthy combos.